Find a relation between cut-off potential, frequency of the incident light and threshold frequency.

Draw a graph showing the variation of stopping potential with frequency of incident radiation Mark the threshold frequency in the figure.

Photoelectric work function for a surface is 2.4 eV. Light of wavelength 6.8 xx 10^(-7) m shines on the surface. Find the frequency of incident light and also the threshold frequency. Will there be photoelectric emission or not ?

One metal sphere of radius r of material with threshold frequency v_0 is kept isolated and light of frequency v is incident on it. Frequency of the incident light is more than the threshold frequency of material. Find the maximum number of electrons which can be emitted from the sphere.

The graph between cut-off potential and frequency of incident radiations in photo-electric effect is

Assertion : The threshold frequency of photoelectric effect supports the particle nature of light. Reason : If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface.