First slide

Photo Electric Effect

Question

Will photo electron be emitted by a copper surface, whose threshold wave length is 2800 $\overset{0}{A}$ when illuminated by visible light ?

Moderate

A

No
B

Yes
C

Yes, if light is very intense
D

Yes, if light is very bright

Solution

The visible light has wavelength range from 3800 $\overset{0}{A}$ to 7000 $\overset{0}{A}$ . These wavelengths are bigger than the threshold wavelength. Hence no photo electrons be emitted.

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