Verified Solution • 2025–26 Session moderate

QJEEM22Phe29c: JEE Main 2022 Physics - Class 12 JEEM22Phe29c Solution: Sun light falls normally on a surface of area and exerts an…

Sun light falls normally on a surface of area 36 cm236 \mathrm{~cm}^{2} and exerts an average force of 7.2×10−9 N7.2 \times 10^{-9} \mathrm{~N} within a time period of 20 minutes. Considering a case of complete absorption, the energy flux of incident light is

Multiple Choice Options

  • A 25.92×102 W/cm225.92 \times 10^{2} \mathrm{~W} / \mathrm{cm}^{2}
  • B 8.64×10−6 W/cm28.64 \times 10^{-6} \mathrm{~W} / \mathrm{cm}^{2}
  • C 6.0 W/cm26.0 \mathrm{~W} / \mathrm{cm}^{2}
  • D 0.06 W/cm20.06\mathrm{~W} / \mathrm{cm}^{2}

Step-by-Step Verified Solution

Pressure =lc= {l \over c}

⇒FA=lc\Rightarrow {F \over A} = {l \over c}

⇒l=7.2×10−9×3×10836×10−4\Rightarrow l = {{7.2 \times {{10}^{ - 9}} \times 3 \times {{10}^8}} \over {36 \times {{10}^{ - 4}}}} W/m2

=600= 600 W/m2

⇒l=0.06\Rightarrow l = 0.06 W/cm2

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