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WBJEE 2021 Physics and Chemistry Solved Paper

Category III (Q36 to Q40)

Carry 2 marks each and one or more option (s) is/are correct. If all correct answers are not marked and also no incorrect answer is marked then score = 2 × number of correct answers marked  actual number of correct answers. If any wrong option is marked or if any combination including a wrong option is marked, the answer will be considered wrong, but there is no negative marking for the same and zero mark will be awarded.

Question : 36

Total: 80

Electric field component of an EM radiation varies with time as E=a(cos‌ω0‌t+sin‌ω‌t‌cos‌ω0‌t), where ' a ' is a constant and ω=1015sec−1,ω0=5×1015sec−1. This radiation falls on a metal whose stopping potential is −2ev. Then which of the following statement (s) is/are true ? (h=6.62×10−34J−S)

For light of frequency ω, photoelectric effect is not possible
Stopping potential vs. frequency graph will be a straight line
The work function of the metal is –2 ev
The maximum kinetic energy of the photo electrons is 1.95 ev.

Validate

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