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) 1.2 × 10–28 kg
(2) 9.1 × 10–31 kg
(3) 4.8 × 10–27 kg
(4) 9.7 × 10–28 kg
