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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 17 March 2021, Shift 1, Physics Q22

Question 22 of 90 in this shift, Physics question 22 of 30, Section B.

If 2.5×10−62.5\times10^{-6} N average force is exerted by a light wave on a non - reflecting surface of 30 cm2^2 area during 40 minutes of time span, the energy flux of light just before it falls on the surface is __________ W/cm2^2. (Round off to the Nearest Integer) (Assume complete absorption and normal incidence conditions are there)

Official answer

25

NTA final key.

Topic
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Idea tested
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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.