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Solution


Q.

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled              [2020]
1 Doubled  
2 Four times  
3 One-fourth  
4 Zero  

Ans.

(4)

Initially, υ=1.5υ0

If the frequency is halved, υ'=υ2=1.5υ02<υ0

Hence, no photoelectric emission will take place.