The threshold wavelength for photoelectric emission from a material is $5500 \overset{o}{A}$ . Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a
A. 75 W infra-red lamp
B. 10 W infra-red lamp
C. 75 W ultra-violet lamp
D. 10W ultra-violet lamp
Choose the correct answer from the options given below:

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A and D only

C and D only

C only

B and C only

answer is C.

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Detailed Solution

Threshold wave length, $λ_{0} = 550 nm$ (visible region).

So, if $λ < λ_{0}$ Photo electrons will be emitted. It will be for ultraviolet lamp irrespective of power.

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