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Solution


Q.

The threshold wavelength for photoelectric emission from a material is 5500 Å. Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a ______                         [2023]

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:
1 B and C only  
2 A and D only  
3 C only  
4 C and D only  

Ans.

(4)

λ<5500 Å for photoelectric emission

λuv<5500 Å