AP EAMCET · PHYSICS · Dual Nature of Matter
A beam of light with intensity and cross sectional area is incident on a fully reflective surface at angle . Then the force exerted by the beam on the surface is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(D)
Step-by-step Solution
Detailed explanation
Force exerted by the beam on the surface is given by F=∆p∆t=2IAcosθc Given here: I=10-3 N m-2, A=20 cm2 and θ=45°. Putting the values, we get F=2×10-3×20×10-4×cos45°3×108=9.4×10-15 N
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