Advertisements
Advertisements
Question
Define the following with reference to photoelectric effect :
(a) Threshold frequency (`f_0`)
(b) Stopping potential (`V_s`)
Solution
(a) The minimum frequency of incident radiation below which photoelectric emission is not possible for a photosensitive plate of a given material, is called threshold frequency (`f_0`) .
(b) The mimimum magnitude of negative potential of the collector plate relative to the emitter plate, for which the photocurrent becomes zero, is called stopping potential (`V_s`) .
APPEARS IN
RELATED QUESTIONS
Plot a graph showing the variation of photoelectric current with intensity of light. The work function for the following metals is given:
Na: 2.75 eV and Mo : 4.175 eV.
Which of these will not give photoelectron emission from a radiation of wavelength 3300
\[A^\circ\] from a laser beam? What happens if the source of laser beam is brought closer?
Write two characteristic features observed is photoelectric effect which supports the photon pictures of electromagnetic radiation ?
Draw a graph between the frequency of incident radiation (υ) and the maximum kinetic energy of the electrons emitted from the surface of a photosensitive material state clearly how this graph can be used to determine (i) Planck’s constant and (ii) work function of the material.
The photocurrent in an experiment on photoelectric effect increases if ______.
Photoelectric effect is ______.
Lenard observed photoelectric effect using
Which one of the following metals does not exhibit emission of electrons from its surface when irradiated by visible light?
In an experiment on photo electric effect, how does stopping potential change, if at all, when intensity of incident monochromatic UV radiation is increased?
