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Question
A pulse of light of duration 100 ns is absorbed completely by a small object initially at rest. Power of the pulse is 30 mW and the speed of light is 3×108 ms−1. The final momentum of the object is
A pulse of light of duration 100 ns is absorbed completely by a small object initially at rest. Power of the pulse is 30 mW and the speed of light is 3×108 ms−1. The final momentum of the object is
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Solution
The correct option is C 1.0×10−17kg ms−1
p=EC=P×tC=3×10−3×100×10−93×108=10−17kg ms−1
p=EC=P×tC=3×10−3×100×10−93×108=10−17kg ms−1
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