A particle is moving 5 times as fast as an
electron. The ratio of the de-Broglie wavelength
of the particle to that of the electron is 1.878 $ \times $
10–4. The mass of the particle is close to
1.2 $ \times $ 10–28 kg
9.1 $ \times $ 10–31 kg
4.8 $ \times $ 10–27 kg
9.7 $ \times $ 10–28 kg
Solution
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