STANDARDPhysics-Electromagnetic Waves
STANDARD Physics Radiation Pressure MCQ Question
Type: MCQ-numerical-Medium-Class 12
Light with an energy flux of 20 W/cm² falls on a non-reflecting surface at normal incidence. If the surface has an area of 30 cm², the total momentum delivered (for complete absorption) during 30 minutes is
A
36 × 10⁻⁵ kg m/s
B
36 × 10⁻⁴ kg m/s
C
108 × 10⁴ kg m/s
D
1.08 × 10⁷ kg m/s
Correct Answer
Option B
Detailed Explanation
The momentum delivered is calculated using p = U/c, where U is the energy carried by light. For complete absorption, U = IAt. Substituting the given values, the momentum is 36 × 10⁻⁴ kg m/s.
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