How is stopping potential related to frequency?
How is stopping potential related to frequency?
For a given intensity of radiation, the stopping potential depends on the frequency. Higher the frequency of incident light higher the value of stopping potential.
Is stopping potential directly proportional to frequency?
o The stopping potential is directly proportional to the frequency of the incident light.
Is stopping potential and threshold frequency same?
Answer : 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 the stopping potential depend on the frequency of the incident light?
In presence of stopping potential, the largest kinetic energy is the initial kinetic energy, which it has at the surface of electrodes. Thus the stopping potential depends upon the frequency of the incident light and the material of the metal surface.
What is 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 the relation between stopping potential and wavelength?
Given: Stopping potential = Vs = 2 V, wavelength of incident light = λ = 2000 Å = 2000 x 10-10 m, speed of light = c = 3 x 108 m/s, Planck’s constant = h = 6.63 x 10-34 Js, Charge on electron = e = 1.6 x 10-19 C.
What is a stopping potential?
What is meant by stopping potential class 12?
Answer: 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.
How does frequency and intensity of incident photons effect stopping potential?
(a) Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation. (b) The stopping potential (V0) varies linearly with the frequency (ν) of the incident radiation for a given photosensitive surface with the slope remaining the same for different surfaces.
What is the relation between frequency of incident radiation and the stopping potential?
The energy of the emitted electrons depends on the frequency of the incident radiations. The stopping potential is more negative for higher frequencies of incident radiation.
What is the threshold frequency?
Definition of threshold frequency : the minimum frequency of radiation that will produce a photoelectric effect.
What does the stopping potential of light depend on?
The stopping potential Vs depends only on the metal and does not depend on the intensity of incident light. a , b , c – different intensites. Example : Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photo-electrons emitted from sodium is 0.73 eV.
What is the stopping potential of a photocathode?
This potential is known as the stopping potential and depends only on the material of the photocathode and the frequency of light. If V s be the stopping potential then eV s = hν − W The stopping potential Vs depends only on the metal and does not depend on the intensity of incident light. a, b, c – different intensites.
What is the work function of threshold frequency?
Work function is different for different metals. A photon having an energy at least equal to the work function can eject electron from the metal, frequency of such a photon whose energy is just equal to the work function is called Threshold Frequency. Work Function ; W = h ν o ; Where, ν o is Threshold Frequency
What happens when the potential difference across the tube is increased?
With an increase in potential difference across the tube, the number of electrons reaching the anode increases. When the potential difference across the tube is increased , the Photo current increases and finally reaches a maximum value (Is) which depends on the intensity of light .
