When a surface is irradiated with light of wavelength `4950A`, a photocurrent appears which
Channel: Doubtnut
Date: 26/07/2020

When a surface is irradiated with light of wavelength `4950A`, a photocurrent appears which vanishes if a retarding potential greater than `0.6V` is applied across the photo tube. When a different source of light is used, it is found that the critical retarding potential is changed to `1.1V`. Find the work function of the emitting surface and the wavelength of the second source.