TS EAMCET · Physics · Dual Nature of Matter
A flashlight of intensity \(9 \mathrm{~W} / \mathrm{cm}^2\) illuminates a perfectly reflective surface of area \(300 \mathrm{~cm}^2\). The average force exerted on the surface due to the incident light photons is
- A \(0 \mathrm{~N}\)
- B \(14 \mu \mathrm{N}\)
- C \(18 \mu \mathrm{N}\)
- D \(12 \mu \mathrm{N}\)
Answer & Solution
Correct Answer
(C) \(18 \mu \mathrm{N}\)
Step-by-step Solution
Detailed explanation
Given, intensity of flash light, \(I=9 \mathrm{~W} / \mathrm{cm}^2\) \(=9 \times 10^4 \mathrm{~W} / \mathrm{m}^2\) Area, \(A=300 \mathrm{~cm}^2=3 \times 10^{-2} \mathrm{~m}^2\) \(\therefore\) Radiation pressure due to incident light photon,…
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