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Q.

The threshold wavelength for photoelectric emission from a material is 5500Å. Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a λ  of  violet<5000Å

A.      75 W infra – red lamp         

B.     10 W infra – red lamp

C.     75 W ultra – violet lamp

D.     10 W ultra – violet lamp

Choose the correct answer from the options given below :

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a

B and C only

b

C only

c

A and D only

d

C and D only

answer is D.

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Detailed Solution

λ<5500Å for photoelectric effect λviolet<5500Å

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