NEET2020Physics-Electromagnetic Waves
NEET 2020 Physics Radiation Pressure and Energy MCQ Question
Type: MCQ-numerical-Easy-Class 12
Light with an average flux of 20 W/cm² falls on a non-reflecting surface at normal incidence having surface area 20 cm². The energy received by the surface during time span of 1 minute is:
A
24 × 10³ J
B
48 × 10³ J
C
10 × 10³ J
D
12 × 10³ J
Correct Answer
Option A
Detailed Explanation
Energy = flux × area × time = 20 W/cm² × 20 cm² × 60 s = 24,000 J = 24 × 10³ J. The original explanation incorrectly computed 48 × 10³ J. The correct answer is A.
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