Photoelectric effect experiment are per-formed using three different metal plates p, q and r having work function, 
and 
respectively. A light beam containing wavelength of 
and 350 nm with equal intensities illuminates each of the plates. The correct I-V graph for the experiment is 
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Text Solution
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For photoelectric emission to take place, the wavelength of incident light should be less than the threshold wavelength for that metal. If 
is the threshold wavelength, then work function of metal
For metal 
For metal 
For metal 
Wavelength in the incident beam are 
and 350 nm. Therefore, the photoelectric emission is possible by light of wavelength 350 nm (being shorter than 
) from metals p, q and r. For light of wavelength 450 nm 
and 496 nm 
photoelectric emission is possible from metals p and q. For light of wavelength 550 nm ( 
), the photoelectric emission is possible from metal p.
Current (I) œ Intensity, where, Intensity 
of photoelectrons. Therefore, I is maximum for P metal, less for q metal and least for r metal. Therefore, graph is correct.
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