The statement is True.
Neurons have a net negative charge when it is at rest. This means that when they are well active, they must have a positive charge.
At rest, neurons have a net negative charge; the inside of neurons is approximately 70 millivolts more negative than the outside. When neurons are active, they must be positively charged in order to generate an action potential.
Neurons have a strong negative charge within them, as opposed to a positive charge outside. This is due to the presence of other molecules known as anions. They are negatively charged but far too large to escape through any available channel. They remain in place and give the cell a negative charge on the inside.
Because of an unequal distribution of positive ions across the membrane, the resting potential is negative; 3 Na+ is pumped out of the cell for every 2 K+ that enters, so the inside of the cell is less negative (less positive) than its surroundings.
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16. How many coulombs of charge pass through a lamp in 1. 2 min if the current is constant at 250 ma?
According to the current, the charge is 18 coulombs.
We need to know about current to solve this problem. Current can be defined as the flowrate of charge through the medium. It can be determined as
I = Q / t
where I is current, Q is charge and t is time.
From the question above, we know that
I = 250 mA = 0.25 A
t = 1.2 min = 72 seconds
By substituting the given parameters, we can calculate the charge
I = Q / t
0.25 = Q / 72
Q = 18 coulombs
Hence, the charge is 18 coulombs.
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Someone standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, which ball has the greatest final velocity upon reaching the ground?.
Both balls have the same velocity upon reaching the ground.
Each ball is given some kinetic energy at the edge of the cliff that takes one upwards and the other down.Since the launching height is the same for both balls each one possesses some potential energy measured relative to the ground down there.Since the air resistance is neglected there would be no resistive forces acting upon each ball that could draw away some of the energy each ball has and therefore, the mechanical energy of each ball is conserved throughout the flight.So, if one writes the energy equation from the edge of the cliff to the ground, it would yield the following result.[tex]\begin{aligned}\\\small K.E +P.E &=\small K.E_1 +P.E_1\\\\\small \frac{mv^2}{2}+mgh&=\small \frac{mV^2}{2}+0\\\\\small V&=\small \sqrt{v^2+2gh}\end{aligned}[/tex]
The magnitude of the final velocity does not depend on the mass of the ball.Therefore, both balls would have the same velocity at the ground as they are given the same initial speed at the same initial height.#SPJ4
A ball is thrown upward with a velocity of 19.6. what us its veloicty after 3 sec
Initial velocity exists at 19.6 m per second. Plus acceleration exists equivalent to expression due to gravity, but it exists downward, so it will be negative -9.8 m per second squared and time exists three seconds, so this exists equivalent to this gives us - 9.8 meter per second velocity after 3 seconds.
How to find the initial velocity?The acceleration of the ball will be a constant [tex]$9.8 \frac{\mathrm{m}}{\mathrm{s}^2}$[/tex] (downward), regardless of whether the ball exists traveling upward or downward.
The equation that makes this calculation simplest is
[tex]$$V_f=V_i-g(\Delta t)$$[/tex]
where the negative sign has been used to account for the opposite directions of [tex]$V_i$[/tex] and g. After 3 seconds,
[tex]$V_f=19.6-(9.8)(3)=19.6-29.4=-9.8 \frac{m}{s}$$[/tex]
The negative result tells us that the ball is on its way downward by this time (consistent with our choice of a negative value for the downward acceleration of gravity).
Initial velocity exists at 19.6 m per second. Plus acceleration exists equivalent to expression due to gravity, but it exists downward, so it will be negative -9.8 m per second squared and time exists three seconds, so this exists equivalent to this gives us - 9.8 meter per second velocity after 3 seconds.
The complete question is:
A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming negligible air resistance?
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What differences would rutherford have observed if he used aluminum foil instead of gold foil?.
The gold sheet used was around 1000 atoms thick.
What differences would Rutherford have observed if he used aluminum foil instead of gold foil?The Rutherford observed that the use of aluminium foil will be better instead of gold foil, the reason is given below. The gold is very cheap metal so due to this property it can be easily turned into thin thin foil, Rutherford wants the thinnest layer as thin as possible. If any other metal foil is used in place of gold then also there will be no change in the observations if the metal foil to be used is as thin as gold foil.
So we can conclude that the gold sheet used was around 1000 atoms thick.
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If the force of gravity exerted on the sun by the earth is the same as the force exerted by the earth on the sun, why does the earth orbit the sun, and not the other way around?
The gravitational pull accelerates the Earth more since it is less heavy and causes it to move more quickly.
What are the three realities of gravity ?The mass of the Earth is what creates gravity. The combined gravitational force of all of its mass acts on the mass in your body. We couldn't survive without gravity. It produces the force that keeps the Earth in orbit around the Sun and keeps us on the surface of the planet. When two objects contact, forces are the mechanism by which energy is transmitted from one to the other, but forces do not themselves contain energy. Since gravity is a force, it only offers one method for objects to exchange energy and change its state.
The weakest force that humans are aware of is gravity.
Weight and gravity are not the same.
Gravity generates waves that move at light speed.
Gravitons, which are massless particles, may carry gravity.
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State the the first law of motion
Answer:
Explanation:
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force
Answer:The first law of motion states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
Calculate the average speed of a complete round trip in which the outgoing 300 km is covered at 93 km/h , followed by a 1.0-h lunch break, and the return 300 km is covered at 56 km/h
The average speed of the complete round trip is 65.57 km / h.
We need to know about the average speed to solve this problem. The average speed can be determined as the total distance divided by the total time. It can be written as
v = d / t
where v is average speed, d is distance and t is time.
From the question above, we know that
d1 = 300 km
v1 = 93 km/h
t lunch = 1 hour
d2 = 300 km
v2 = 56 km/h
Find the time during the outgoing
v1 = d1 / t1
t1 = d1 / v1
t1 = 300 / 93
t1 = 3.23 hours
Find the return time
v2 = d2 / t2
t2 = d2 / v2
t2 = 300 / 56
t2 = 5.36 hours
Hence, the total time
t = t1 + t2 + t lunch
t = 3.23 + 5.36 + 1
t = 9.59 hours
Find the average speed
v = d / t
v = (300 + 300) / 9.59
v = 65.57 km / h
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two gliders are set in motion on a horizontal air track. a light spring of force constant k is attached to the back end of the second glider. both gliders are having the same mass m. the first glider moves to the right with speed v1 and the second is at rest. when the first glider collides with the spring attached to the second glider, the spring compress by a distance xmax, and the gliders then move apart again. in terms of v1, m, and k, find
The constant velocity of center of mass when the spring is at maximum compression is V = ( [tex]m_{1} v_{1}[/tex] + [tex]m_{2} v_{2}[/tex] ) / ([tex]m_{1} + m_{2}[/tex] )
When two objects collide the momentum is always conserved no matter the type of collision. But in case of kinetic energy, it is conserved only if the collision is elastic. Here the collision is elastic due to the presence of a spring. So, in this situation kinetic energy is conserved.
At maximum compression, According to law of conservation of momentum,
Sum of linear momentum before collision = Sum of linear momentum after collision
[tex]m_{1} v_{1}[/tex] + [tex]m_{2} v_{2}[/tex] = ([tex]m_{1} + m_{2}[/tex] ) V
V = ( [tex]m_{1} v_{1}[/tex] + [tex]m_{2} v_{2}[/tex] ) / ([tex]m_{1} + m_{2}[/tex] )
where,
V = Velocity of center of mass
[tex]m_{1}[/tex] = Mass of glider 1
[tex]m_{2}[/tex] = Mass of glider 2
[tex]v_{1}[/tex] = Velocity of glider 1
[tex]v_{2}[/tex] = Velocity of glider 2
Therefore, the constant velocity of center of mass when the spring is at maximum compression is V = ( [tex]m_{1} v_{1}[/tex] + [tex]m_{2} v_{2}[/tex] ) / ([tex]m_{1} + m_{2}[/tex] )
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If the outside air temperature increases during a flight at constant power and at a constant indicated altitude, the true airspeed will:__________
The true airspeed will increase and true altitude will increase.
What is true air speed?True airspeed is the airspeed of an aircraft relative to undisturbed air.
It's the aircraft speed relative to the airmass in which it's flying.
How does outside air temperature affect air speed?If the outside air temperature increases during a flight at constant power and at a constant indicated altitude, the true airspeed will increase and true altitude will increase.
Thus, the true airspeed will increase and true altitude will increase.
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How many grams of calcium metal is required to react with 7.75 g water to produce calcium hydroxide and hydrogen gas?
87.69 grams of calcium metal is required to react with 7.75 g water to produce calcium hydroxide and hydrogen gas.
Ca (OH)2+2H2 = CaH2 + 2H2O
Convert grams of hydrogen to moles of hydrogen.
H2 has a molar mass of 2.016 g/mol.
1 mol H2 x 8.400g H2
2.016g H2 equals 4.1667 mol H2
Calculate the moles of CaH2 using the molar ratio.
The molar ratio is 1 mol CaH2: 2 mol H2, according to the equation that is balanced.
2.0833 mol CaH2 = 4.1667 mol H2 1 mol CaH2 2 mol H2
grams of CaH2 to CaH2
CaH2 has a molar mass of 42.09 g/mol.
1.mol CaH2=87.69 g CaH2 2.0833mol CaH2=42.09 g CaH2
87.69 g CaH2 are required for the reaction.
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A student investigated how different coloured light was refracted by glass.
The student aimed rays of different coloured light at a glass block.
She measured the angle of refraction for each colour.
Give two variables that the student should control.
Two variables the student should control in the experiment are:
amount of lightthe angle of incidence of the incident light.What are variables in an experiment?Variables in an experiment refers to those factors which can be changed by the researcher and these changes in these variables will result in changes in the result of the experiment.
There are three types of variables in an experiment and they are:
Independent variable: this variable does is changed by the researcher and results in changes in the variable being tested.
Dependent variable: this is the variable being tested and is affected by changes in the independent variable.
Control or constant variable : this variable is kept constant in the experiment.
Considering the investigation by the student:
the student investigated how different colored light was refracted by glassthe student aimed rays of different colored light at a glass block measured the angle of refraction for each colorTwo variables the student should control are:
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The wire loops in a simple dc motor are wound around an iron core called an armature. constant rotation of the armature provides ________ to operate mechanical devices.
Mechanical power is being provided for constant rotation of the armature in operating mechanical devices.
The armature has two functions. The first is to transport current across the field, resulting in shaft torque in a rotating machine or force in a linear machine. The second function is to create electromotive force (EMF).
The relative motion of the armature and the field produces an electromotive force in the armature. When employed as a motor, the EMF opposes the armature current, and the armature transforms electrical power to mechanical power in the form of torque and transfers it via the shaft. The armature EMF drives the armature current, and the shaft movement is converted to electrical power when the machine is utilized as a generator.
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What is the frequency (s-1) the light from a laser with a wavelength of 615 nm? enter your answer with three decimals and no units.
The frequency of light from a laser is 4.878 x10^ 14 s-1 hertz
Stepsv= c/ lambda
c= 3.00 x10^8 m/s
nm into meters
615nm (1m/ 1x10^9 nm) = 6.15x 10^-7 m
use frequency formula
v = 3.00 x10^8 m/s // 6.15 x10 ^-7
v = 4.878 x10^ 14 s-1 hertz
The frequency of light from a laser is 4.878 x10^ 14 s-1 hertz
What do you mean by frequency?The quantity of waves that pass a set location in a predetermined period of time is known as frequency. Therefore, if a wave passes through in half a second, the frequency is 2 per second. The frequency is 100 times per hour if it takes 1/100 of an hour.
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A copper block weighing 2 kg is dropped from a height of 20m. what is the rise in the temperature of the copper block after it hits the floor. the specific heat capacity of copper is 400 j/(kgc )
The rise in temperature of the copper block after hitting the floor is 0.49°c
What is specific heat capacity?The quantity of heat energy needed to raise a substance's temperature per unit of mass is known as specific heat capacity. A material's specific heat capacity is a physical characteristic. Since its value is inversely correlated with the size of the system under study, it is also an illustration of an extended feature.
What is law of conservation of energy?Energy can only be transformed from one form to another. It cannot be created or destroyed.
How will this question be solved?From the law of conservation of energy we know,
The potential energy of the block= cmΔT
mgh= cmΔT
m×9.8×20= 400×m×ΔT
196=400ΔT
ΔT=0.49°C
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A ball is thrown directly downward with an initial speed of 7.40 m/s from a height of 30.8 m. after what time interval does it strike the ground?
The time interval in fall motion is 1.86 seconds.
We need to know about fall motion to solve this problem. Gravity has a big role in fall motion. It can be described as
vt = vo + g . t
vt² = vo² + 2 . g . h
h = vo . t + 1/2 . g . t²
where vo is initial speed, vt is final speed, g is the gravitational acceleration (9.8 m/s²), h is height and t is time.
From the question above, we know that:
h = 30.8
vo = 7.4 m/s
Find the final velocity
vt² = vo² + 2 . g . h
vt² = 7.4² + 2 . 9.8 . 30.8
vt² = 54.76 + 603.68
vt² = 658.44
vt = 25.66 m/s
Find the time interval
vt = vo + g . t
25.66 = 7.4 + 9.8t
9.8t = 18.26
t = 1.86 seconds
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An extensible wire that obeys looks low it stands by 5.00 mm when it's elastic potential energy is 50j. calculate the value for force constant of the wire
By using Hooke's Law, the force constant is 4 x 10⁶ N/m.
We need to know about Hooke's Law to solve this problem. Hooke's Law describes the force applied to spring (elastic materials) will proportional to spring constant and displacement under the elastic condition. It can be described as
F = k . x
where F is force, k is spring constant and x is displacement.
The potential energy of spring can be determined as
PE = 1/2 . k . x²
where PE is potential energy
From the question above, we know that
x = 5 mm = 0.005 m
PE = 50 joule
By substituting the given parameter, we can calculate the force constant of the wire
PE = 1/2 . k . x²
50 = 1/2 . k . (0.005)²
k = 4 x 10⁶ N/m
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The common element among measures of speed, rate, and latency is _________. group of answer choices performance frequency time reactivity
The common element among measures of speed, rate, and latency is time.
What is time ?The only science that specifically studies time is physics, but even physicists acknowledge that time is one of the most challenging aspects of our universe to comprehend. However, time is typically seen as an ontologically "fundamental" or primary idea and is not composed of or dependent upon anything else, even in the most advanced and sophisticated physical models.
Time is typically defined by its measurement in the sciences; it is only what a clock says. Since physics in particular frequently requires extremely precise time measurements, time must be regarded as an infinitely divisible linear continuum and not as a quantized quantity (i.e. composed of discrete and indivisible units). Time can now be measured accurately to about 1015 seconds thanks to contemporary atomic time standards like TAI and UTC and extremely precise atomic clocks. This is equivalent to about 1 second of error in roughly 30 million years.
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If the concentration of the product of a reaction goes from 0.55 m to 0.85 m over 6 minutes, what is the average rate of reaction over that time period in mmin?
Answer: 0.05 M/min
Explanation: (0.85 - 0.55)/ 6 mins
if tou were to become a scientist what will be your contribution to the society? why?
________ provides the raw material for evolution because it can create new alleles, which are alternative forms of the same ______.
Mutation provides the raw material for evolution because it can create new alleles, which are alternative forms of the same gene.
A mutation is a variation or change that occurs spontaneously in the sequence of the genes that make up the deoxyribonucleic acid (DNA).
Mutations can occur at three different levels:
Molecular (gene or point): Occurs in the DNA sequenceChromosomal: A chromosome segment is altered Genomic: Affects a specific set of chromosomeWhat is a gene?In biology, a gene is a unit composed of a chain of deoxyribonucleic acid (DNA) that contains the necessary information to transfer hereditary traits from one generation to the next.
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An electron not only moves around the nucleus but also on its own axis, thus generating a tiny field. The direction of this field is described by the quantum number, ms, which is not related to any specific orbital but is a property of the electron itself. True or false?.
Yes, the given statement is true.
An electron not only moves around the nucleus but also rotates on its own axis, thus generating a tiny magnetic field. The direction of the field is described by the spin quantum number, ms, which is not related to any specific orbital but is a property of the electron itself.
An atom is made up of three fundamental particles electrons, protons, and neutrons, and a positively charged nucleus. In an atom, electrons rotate on their axis as well as aorund the nucleus.
The rotational movement of electrons around the nucleus creates a magnetic field.
However, the magnetic forces cancel out each other due to the opposite spins of the electrons.
similarly, in a wire, the movement of electrons generates a magnetic field around the wire.
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Describe a situation in which you can accelerate even though your speed doesn’t change.
Acceleration is not the same as speeding up. It refers to any modification of motion's direction or speed. Accelerated motion is any movement that is not constant speed in a straight line.
What is meant by acceleration?In physics, acceleration refers to the rate at which an object's velocity over time changes. They are accelerations and vector quantities. The direction of an object's acceleration is determined by the direction of the net force acting on it.
Depending on whether an object is moving faster, slower, or in a different direction, its velocity may change. Examples of acceleration include a falling apple, the moon orbiting the earth, and a car that has stopped at a stop sign.
Acceleration is the measure of a change in velocity. Acceleration frequently, though not always, denotes a shift in speed. The direction of motion is changing, therefore an object moving at a constant speed in a circular path is still moving ahead.
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A tie fighter is traveling around naboo with a velocity of 607 m/s. the tie fighter slows down at a rate of -7.5m/s^2 for 14.6 s. how far did the tie fighter travel while slowing?
The Total Distance covered by the train while slowing down is 8062.85 meters.
In the given situation,
We can find the distance covered by the tie fighter from the formula :
=> [tex]S = ut + \frac{1}{2}at^{2}[/tex]
Here S = Distance, u = Initial Velocity, t = Time taken, a = Acceleration
It is given that, u = 607m/s, t = 14.6s, a = -7.5 m/s^2
The negative Acceleration means it is a case of Slowing down.
Putting values into the equation,
=> S = (607)*(14.6) + (1/2)*(-7.5)*(14.6)^2
=> S = 8862.2 + (-799.35)
=> S = 8062.85
The total distance traveled while slowing is: 8062.85m
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What two principal factors affect the force of air resistance on a falling object?.
The two principal factors that affect the force of air resistance on a falling object are frontal area and speed, because the force mostly depends on these two factors.
What is air resistance?When an object falls through the air, it mostly encounters some sort of resistance to its speed and this resistance is named air resistance.
This resistance is present because of the collisions of the air molecules with the frontal surface molecules of the object.
Simply state, the two most common factors that have an impact on the degree of air resistance can be said out as the speed of the object and then the cross-sectional are of the object.
Because the more the speed, the more the air resistance and so is the case with the cross-sectional area.
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When leak channels are present, why does a capacitive current flow in the reverse direction after the stimulus current has ended?
Capacitor always needs a resistive path to charge or discharge.
Suppose the capacitor is charging through the path R1 and its current flow direction is also shown as per the figure.
Now suppose fully charged capacitor is disconnected from the circuit, hence there will be no current flow out from the capacitor.
But practically ideal capacitors do not exist, there must have some leakage paths suppose R2 and i2.
Therefore, we can see that i1 was entering to C but i2 was leaving C. Hence Capacitive current flow is in reverse direction.
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How much work does it take to slide a crate m along a loading dock by pulling on it with a -n force at an angle of from the horizontal?
The work needed to slide the crate at a distance of 22 m is
[tex]$W=4.38 \times 10^3 J$[/tex]
What is meant by work done?The work done by a constant force on an object as the object moves along a displacement vector [tex]$\vec{d}$[/tex] is given by the formula involving the dot product of the two vectors:
[tex]$W=\vec{F} \cdot \vec{d}=F d \cos (\theta)$$[/tex]
Where [tex]$\vec{F}[/tex], F is the force vector and its magnitude respectively, [tex]$\vec{d}[/tex], d is the displacement vector and its magnitude respectively and [tex]$\theta$[/tex] is the angle between the displacement vector and the force vector.
Given:
Force acting on the crate, F = 230 N
Distance traveled by the crate,
[tex]$d=22 \mathrm{~m}$$[/tex]
The angle between the force and the displacement,
[tex]$$\theta=30^{\circ}$$[/tex]
Then the work done by the force on the crate as it travels 22 m under the action of the force is
[tex]$W &=F d \cos \theta \\[/tex]
[tex]$&=230 \times 22 \cos 30^{\circ} \\[/tex]
simplifying the above equation, we get
[tex]$&=230 \times 22 \times \frac{\sqrt{3}}{2} \\[/tex]
[tex]$&=4382.089 \mathrm{~J} \\[/tex]
[tex]$&=4.38 \times 10^3 \mathrm{~J}[/tex]
Therefore the work needed to slide the crate at a distance of 22 m is
[tex]$W=4.38 \times 10^3 J$[/tex]
The complete question is:
How much work does it take to slide a crate 22m along a loading dock by pulling on it with a [tex]$230-\mathrm{N}$[/tex] force at an angle of [tex]$30^{\circ}$[/tex] from the horizontal?
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Which has zero acceleration?
a. at rest.
b. moving at constant velocity.
c. in mechanical equilibrium.
d. all of these
e. none of these
At rest, when travelling at a constant speed, and when in mechanical equilibrium, there is no acceleration and answer choice D is correct.
How would you define acceleration?In mechanics, acceleration describes the rate at which a driving object's velocity changes over time. They are accelerations and vector quantities. The direction of an object's acceleration is determined by the direction of the net force acting on it. Depending on whether an object is moving faster, slower, or in a different direction, its velocity may change. Examples of acceleration include a falling apple, the moon orbiting the earth, and a car that has stopped at a stop sign. The car is positively accelerating if the speed is increasing. As the car slows down, its speed decreases. A decline in speed is referred to as negative acceleration. In both situations, the car is traveling ahead, yet one has a positive acceleration and the other a negative one.
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If the car maintains its constant acceleration, how much additional time does it take the car to reach a velocity of 35.0 m/sm/s ? express your answer in seconds.
5 seconds is the additional time.
Describe acceleration using an example.It is possible for an object's velocity to alter by increasing, decreasing, or changing its direction of motion. A few instances of acceleration include an apple falling to the ground, the moon orbiting the earth, and a car coming to a stop at a set of traffic lights.How is acceleration measured?A metre per second (m/s2) is used to measure acceleration. The newton is the unit of force responsible for producing an acceleration of one meter per second per second when applied to a mass of one kilogram.learn more about acceleration here
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Which photon energies will excite the hydrogen atom when its electron is in the ground state?
The photon energy excite the hydrogen atom when its electron is in the ground state −13.6eV.
The second energy level is -3.4 eV.
Therefore, if we calculate the energy levels E₁ & E₂
E₂ − E₁ = -3.4 eV − -13.6 eV = 10.2 eV
Hence, the above expression shows, to excite the electron from the ground state to the first excited state. Similarly
The energy of the electron in ground state is −13.6eV.and the energy required to move electrons from ground state to third excited state is 12.75eV.
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Need the answer badddd without this app I’d be screwed
Answer:
B
Explanation:
The first modern personality test was the Woodworth Personal Data Sheet, which was first used in 1919. It was designed to help the United States Army screen out recruits who might be susceptible to shell shock.
so, B is correct
Answer:
The answer is B, I hope this helps.