The de Broglie wavelengths of a proton and an $\alpha$ particle are $\lambda$ and $2\lambda$ respectively. The ratio of the velocities of proton and $\alpha$ particle will be: (1) $1 : 8$ (2) $1 : 2$ (3) $4 : 1$ (4) $8 : 1$
The de Broglie wavelengths of a proton and an $\alpha$ particle are $\lambda$ and $2\lambda$ respectively. The ratio of the velocities of proton and $\alpha$ particle will be:\\
(1) $1 : 8$\\
(2) $1 : 2$\\
(3) $4 : 1$\\
(4) $8 : 1$