JEE Main 2022PhysicsElectromagnetic WavesMediumMCQ

JEE Main 2022 — Electromagnetic Waves Question with Solution

JEE Main 2022 (28 Jul Shift 2)

Question

Sun light falls normally on a surface of area 36 cm2 and exerts an average force of 7.2×10-9 N within a time period of 20 minutes. Considering a case of complete absorption, the energy flux of incident light is

Choose an option

Show full solutionCorrect option: D
Correct answer
D0.06 W cm-2

Step-by-step explanation

The radiation pressure in case of complete absorption is given by,

P=Ic.

Therefore, the force will be,

F=Ic×A⇒I=FcA

⇒I=7.2×10-9×3×10836×10-4=600 W m-2⇒I=0.06 W cm-2

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About this question

This is a previous-year question from JEE Main 2022, covering the Electromagnetic Waves chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.