Does the thresold frequency depend on intensity of light?

In photoelectric effect, does the photoelectric current depend on the intensity of incident radiation? Give reasons.

Does the critical angle depend on the wavelength of light?

On what factors does the threshold frequency depend?

The _____ shaped cells present in retina respond to the intensity of light.

If the frequency of incident radiations is equal to the thresold frequency, what will be the value of stopping potential?