What is the stopping potential in photoelectric effect?
What is the stopping potential in photoelectric effect?
The negative potential of the collector plate at which the photoelectric current becomes zero is called stopping potential or cut-off potential. Stopping potential is that value of retarding potential difference between two plates which is just sufficient to halt the most energetic photoelectrons emitted.
How do you find the stopping potential in photoelectric effect?
To Find: Stopping potential = Vs =? Given: Initial frequency = ν1 = 2.2 x 1015 Hz, initial stopping potential = Vs1 =6.6 V, Final frequency = ν2 = 4.6 x 1015 Hz, Final stopping potential = Vs2 = 16.5 V, Charge on electron = e = 1.6 x 10-19 C.
What is the stopping potential for electrons?
The stopping voltage (or stopping potential) refers to the voltage difference required to stop electrons from moving between plates and creating a current in the photoelectric experiment.
What is the effect of potential on photoelectric effect?
For a fixed frequency, the photoelectric current increases linearly with increase in intensity of incident light. When –ve potential is applied to the plate A w.r.t. C, photoelectric current becomes zero at a particular value of –ve potential called stopping potential or cut-off potential.
What is cutoff or stopping potential?
Stopping potential or cut-off potential is defined as the required potential for stopping the removal of an electron from a metal surface when the incident light energy is greater than the work potential of the metal on which the incident light is focused.
What is stopping potential and threshold frequency?
Threshold frequency is the minimum frequency of the incident light which can cause the ejection of electrons without giving them additional energy. The amount of potential that is required to stop the electron having the maximum kinetic energy from moving is known as stopping potential. Numerical.
What is stopping potential or cut-off potential?
What is a stopping potential?
Stopping potential is the minimum negative voltage applied to the anode to stop the photocurrent. The maximum kinetic energy of the electrons equal the stopping voltage, when measured in electron volt.
What is photoelectric effect define threshold frequency and stopping potential?
Stopping potential or the cut-off potential is the minimum value of negative potential at anode which just stops the photo electric current. Threshold frequency is the minimum frequency of light below which photoelectric effect does not take place.
Does photoelectric current depends on stopping potential?
(d) : The stopping potential depends on frequency of incident light and the nature of the emitter material. For a given frequency of incident light, it is independent if its intensity.
What is meant by stopping potential?
What is the photoelectric effect define stopping potential and photoelectric work function?
(i) Stopping -potential : The minimum negative potential given to the plate for which photo electric current stop or become zero. (ii) Photo electric work function : The minimum energy required to remove electron from a given surface is called photo electric work function.
What is the stopping voltage of a photoelectric effect?
The voltage that has to be applied to do this is called the ‘stopping voltage’. It is given the symbol VS The energy supplied to the electrons by the electric field to exactly counter their kinetic energy = eVS EK= eVS Now, we know that hf = φ + EK(MAX)
What is the symbol for the photoelectric effect?
It is given the symbol V S The energy supplied to the electrons by the electric field to exactly counter their kinetic energy = eV S This has the form of a straight line graph.
How to calculate the photoelectric effect of a graph?
You can even relate the photoelectric effect formula to the formula for a straight line graph if it helps you remember what the three parts of the graph represent. y= mx+ b Ekmax= hf + –W hf = Ekmax+ W
Why is the photoelectric effect different for different metals?
This is because the attractive forces that bind the electrons to the metal are different for different metals. It can also be noted that the photoelectric effect can also take place in non-metals, but the threshold frequencies of non-metallic substances are usually very high.
