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A pulse of light of duration `100ns` is absorbed completely by a small object initially at rest power of the pulse is `30 mW` and the speed of light is `3 xx 10^(8) ms^(-1)` The final momentum of the object isA. `0.3 xx 10^(-17) kg ms^(-1)`B. `1.0 xx 10^(-17) kg ms^(-1)`C. `3.0 xx 10^(-17) kg ms^(-1)`D. `9.0 xx 10^(-17) kg ms^(-1)` |
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Answer» Correct Answer - B Change in momentum `= ("power" xx "total time")/("speed of time") = (P xx t)/(c)` `1.0 xx 10_(-17) kg xx m//s` |
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