Question

A particle is moving three time as fast as an electron. The ratio of the de-Broglie wavelength of the particle to that of the electron is 1.813×10^–4. Identify the particle 

(1) decutron

(2) α particle

(3) a protonor a neutron

(4) particle cannot be identified from the given data

Answer 1

Correct option : (3) a proton or a neutron

Explanation :

Let λ_p and λ_e denote the de-Broglie wavelength of the particle and electron

This could be the mass of a proton or a neutron.