Answer the following with reference to the photo-electric effect.
PHYSICS · Multi-part · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter
Problem
Answer the following with reference to the photo-electric effect.
(i) Define threshold frequency and stopping potential.
(ii) Explain why no photo-electrons are emitted when the frequency of incident light is lower than the threshold frequency, no matter how high the light intensity is.
(iii) Give a reason why the stopping potential depends on the frequency of light but is independent of its intensity.
(iv) A metal surface has a threshold wavelength of 620nm. Calculate its work function in electron-volts.