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Question

A green ball weighs 75g; it is travelling towards observer at a speed of 400cm/sec. The ball emits light of wavelength 5×105cm. Assuming that the error in the position of ball is the same as wavelength of itself, calculate error in the momentum of the green ball.

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Solution

ΔxΔph4π
Δph4πΔx
Δph4πλ
Δp=6.626×10274×3.14×5×105=1.055×1023.

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