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JEE Main 20248 AprilMorning Shift
Exam
JEE Main
Year
2024
Date
8 April
Shift
Morning Shift
Subject
Physics
Chapter
Dual Nature of Matter

JEE Main 2024 · 8 April · Morning Shift · Physics · Dual Nature of Matter

Average force exerted on a non-reflecting surface at normal...

Average force exerted on a non-reflecting surface at normal incidence is 2.4×10−4 N2.4 \times 10^{-4} \mathrm{~N}. If 360 W/cm2360 \mathrm{~W} / \mathrm{cm}^2 is the light energy flux during span of 1 hour 30 minutes, Then the area of the surface is:

Options

  1. A0.2 m20.2 \mathrm{~m}^2
  2. B20 m220 \mathrm{~m}^2
  3. C0.1 m20.1 \mathrm{~m}^2
  4. D0.02 m20.02 \mathrm{~m}^2

Correct answer

D. 0.02 m20.02 \mathrm{~m}^2

Step-by-step solution

 Pressure =IC=FA⇒36010−4×3×108=2.4×10−4A⇒A=2×10−2m2=0.02m2\begin{aligned} & \text{ Pressure }=\frac{I}{C}=\frac{F}{A} \\ & \Rightarrow \frac{360}{10^{-4} \times 3 \times 10^8}=\frac{2.4 \times 10^{-4}}{A} \\ & \Rightarrow \mathrm{A}=2 \times 10^{-2} \mathrm{ m}^2=0.02 \mathrm{ m}^2\end{aligned}
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