JEE Main 2022 · 28 Jul · Shift 2 · Physics Q15

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PhysicsSingle correct+4 / -1Question 15 of 90

Sun light falls normally on a surface of area 36 cm $^2$ and exerts an average force of $7.2\times10^{-9}$ N within a time period of 20 minutes. Considering a case of complete absorption, the energy flux of incident light is

25.92\times10^2

W/cm

^2

8.64\times10^{-6}

W/cm

^2

6.0 W/cm

^2

0.06 W/cm

^2

Answer and worked solution

Official answer: D

Complete absorption. $F=\frac{IA}c$ , so $I=\frac{7.2\times10^{-9}\times3\times10^8}{36}=0.06$ W/cm $^2$ .

(D)

Topics:Photon momentum and radiation pressure

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JEE Main 2022 · 28 Jul · Shift 2, Physics question 15