List of top Physics Questions on Dual nature of matter asked in KEAM

If the de Broglie wavelengths of deuteron, positron and electron are in the ratio $1:2:3$, then the ratio of their respective momenta is

The de Broglie wavelength and kinetic energy of a particle is 2000 Å and 1 eV respectively. If its kinetic energy becomes 1 MeV, then its de Broglie wavelength is