The ratio of the de Broglie wavelength of a proton and alpha particles will be `1:2` if their

Find the ratio of de Broglie wavelength of proton and alpha -perticle of same energy

Find the ratio of de Broglie wavelength of a proton and as alpha -particle which have been accelerated through same potential difference.

Find the ratio of de Broglie wavelength of a proton and as alpha -particle which have been accelerated through same potential difference.

If the de - Broglie wavelengths for a proton and for an alpha - particle is equal , then what is the ratio of velocities for proton and alpha particle?