Light of wavelength from a small 0 5mW He Ne laser source used in the...

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Light of wavelength from a small 0 5mW He Ne laser source used in the school laboratory shines from a spacecraft of mass 1000 kg Estimate the time needed for the spacecraft to reach a velocity of 1 0 km s 1 from rest The momentum p of a photon of wavelength is given by p h 2 where h is Plank s constant A 6 1018 B 3 x 1017 C 6 x 1017 D 2 x 1015

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