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JEE Mains · Physics · STD 12 - Dual nature of radiation and matter
- JEE Mains 2019
- Hard
- MCQ
\(50\, W/m^2\) energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy \((25\%)\) is reflected from the surface and the rest is absorbed. The force exerted on \(1\, m^2\) surface area will be close to \((c = 3 \times10^8\, m / s)\)
Pick an option to check your answer.
Answer & Solution
Correct Answer
(D) \(20 \times {10^{ - 8}}\,N\)
Step-by-step Solution
Detailed explanation
Radiation pressure for \(100 \%\) reflection \(=\frac{2I}{\mathrm{C}}\)
Radiation pressure for \(0 \%\) reflection \(=\frac{I}{\mathrm{C}}\)
Hence, in given case, radiation pressure \( = (0.25)\left( {\frac{{2I}}{{\text{C}}}} \right) + (0.75)\left( {\frac{I}{{\text{C}}}} \right)\)
\( = (1.25)\left( {\frac{I}{{\text{C}}}} \right)\)
Force \(=\mathrm{P} \times(\text { Area })\)
\(=20.83 \times 10^{-8}\, \mathrm{N}\)
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