pulse of light of duration 10−6 s is absorbed completely by a small object initially at rest. If the power of the pulse is 60 × 10−3 W, calculate the final momentum of the object.
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Duration of the absorption of light pulse, t = 10 ^ - 6 * s
Power of the pulse P = 60 * 10 ^ - 3 W
Final momentum of the object, P = U/C
Velocity of light, C = 3 * 10 ^ 8
Energy U = pow x time
Momentum,
P = (60 * 10 ^ - 3 * 10 ^ - 6)/(3 * 10 ^ 8)
P=20*10^ -17 kg m s^ -1
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