Question

A proton and electron have same velocity. Which one has greater de Broglie wavelength and why?

Answer 1

The de-Broglie wavelength λ is given for mass m and velocity v of a particle as Now for an electron and proton velocity v is given same.Since $m_p>m_e$ We have inverse relations of λ and massSo $\lambda p<\lambda e$, Thus electron would have greater wavelength than wavelength of proton accelerated with same velocity.