A particle is moving 5 times as fast as an electron. The ratio of the de-Broglie wavelength of the particle…

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  1.878×10–4. The mass of the particle is close to :
  1. 4.8×10-27 kg
  2. 9.1×10-31 kg
  3. 1.2×10-28 kg
  4. 9.7×10-28 kg

Solution

λ=hmv
⇒  m'm=vλv'λ'=15×11.878×10-4×9.1×10-31
m'=9.7×10-28kg

Asked in: JEE Main 2020 (02 Sep Shift 2)

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