If light of wavelength 412.5 nm is incident on each of the metals given below, which one will show photoelectric emission and why?

Alkali metals show photoelectric effect, why ?

The threshold frequency for a certain metal is 3.3 xx 10^14 Hz . If light of frequency 8.2 xx 10^14 Hz is incident on the metal, predict the cut-off voltage for the photoelectric emission.

Alkali metals show photoelectric effect. Why ?

The thresold frequency for a certain metal is 3.3 xx 10^(14) Hz (Hertz). If the light of frequency 8.2 xx 10^(14) Hz (Hertz) is incident on the metal, find the cut off voltage for photoelectric emission.

Why the alkali metals are most suitable for studying the photoelectric emission?

Photoelectric effect When light of sufficiently small wavelength is incident on a metal cathode, it may emit electsons called photoelectrons. This is called photoelectric effect. Above threshold frequency, the stopping potential and hence the energy of the photoelectrons is directly proportional to the frequency. In the given figure, we see the variation of stopping potential with the frquency of incident radiation for three metals A, B and C Which of these metals A, B or C are suitable for photoelectric cell?