Stopping Potential and kinetic potential

In summary, the stopping potential in the equation max kinetic_energy= e*Vs refers to the voltage difference between the V_Emitter and V_collector, and can be either positive or negative depending on the definition. The charge 'e' in this equation is the elementary charge, which is positive, and when multiplied by the voltage, will result in a positive number with the correct units.
  • #1
kougou
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[URGENT! Stopping Potential~~~~~~~#######~~~~~~~~~~~~~~~~

Homework Statement



max Kinetic_energy= e*Vs=hf-work_function

Vs is the stopping potential


The attempt at a solution

I am wondering, does this stopping potential refers the voltage difference of
V_Emitter (where the line shines on) - V_collector(where the electron travels to), and thus, the stopping potential is usually positive?

Also, for that equation max kinetic_energy= e*Vs, 'e' is just the charge= +ve 1.602*10^-19?
so that the max kinetic energy in this case, (+5 V)*(+ 1.602*10^-19)= +ve number?
 

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  • #2
I am wondering, does this stopping potential refers the voltage difference of
V_Emitter (where the line shines on) - V_collector(where the electron travels to), and thus, the stopping potential is usually positive?
If you use e as elementary charge, it has to be positive.
If you use the electron charge, you need the opposite direction, and a negative voltage. That is just a matter of definition.
so that the max kinetic energy in this case, (+5 V)*(+ 1.602*10^-19)= +ve number?
What do you mean with "+ve number"? If you add units, you will get the right result.
 

1. What is the difference between stopping potential and kinetic potential?

Stopping potential refers to the minimum amount of energy required to completely stop an object in motion. It is dependent on the mass and velocity of the object. On the other hand, kinetic potential is the energy that an object possesses due to its motion. It is dependent on the mass, velocity, and height of the object.

2. How are stopping potential and kinetic potential related?

Stopping potential and kinetic potential are related in the sense that both are forms of energy that are dependent on the motion of an object. Stopping potential is the minimum amount of energy required to stop an object, while kinetic potential is the energy that an object possesses due to its motion.

3. Can stopping potential be greater than kinetic potential?

No, stopping potential cannot be greater than kinetic potential. This is because stopping potential is the minimum amount of energy required to stop an object, while kinetic potential is the energy that an object possesses due to its motion. Therefore, the stopping potential must be less than or equal to the kinetic potential.

4. How is stopping potential measured?

Stopping potential is typically measured using a device called a voltmeter. The voltmeter measures the voltage difference between two points in a circuit. By adjusting the voltage until the current stops flowing, the stopping potential can be determined.

5. What factors affect stopping potential and kinetic potential?

Stopping potential and kinetic potential are affected by several factors, including the mass and velocity of the object, as well as the height and distance of the object's motion. Additionally, external forces such as friction and air resistance can also impact these forms of energy.

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