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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. 1.2 × 10 – 28 kg
3. 9.1 × 10 – 31 kg
4. 9.7 × 10 – 28 kg

Correct answer: 9.7 × 10 – 28 kg

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