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QJEEM19Ph4159: JEE Main 2019 Physics - Class 12 JEEM19Ph4159 Solution: 50 W/m 2 energy density of sunlight is normally incident on the …

50 W/m2 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 1m2 surface area will be close to (c = 3 × 108 m/s) :-

Multiple Choice Options

  • A 20 × 10–8 N
  • B 35 × 10–8 N
  • C 10 × 10–8 N
  • D 15 × 10–8 N

Step-by-Step Verified Solution

Radiation pressure for 100% reflection = 2IC

Radiation pressure for 0% reflection = IC

Hence, in given case, radiation pressure

= (0.25)(2IC)+(0.75)(IC)

(1.25)(IC)

∴ Force = P × (Area) = 20.83 × 10–8 N

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