NEET2014Physics-Electromagnetic Waves
NEET 2014 Physics Radiation Pressure MCQ Question
Type: MCQ-numerical-Medium-Class 12
Light with an energy flux of 25 × 10⁴ Wm⁻² falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm², the average force exerted on the surface is
A
1.25 × 10⁻⁶ N
B
2.50 × 10⁻⁶ N
C
1.20 × 10⁻⁶ N
D
3.0 × 10⁻⁶ N
Correct Answer
Option B
Detailed Explanation
The force is given by F = 2IA/c, where I is the intensity, A is the area, and c is the speed of light. Substituting the values gives 2.50 × 10⁻⁶ N.
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