Three particles are prepared as follows:
P: an electron given 150eV of kinetic energy,
Q: an α-particle (charge +2e, mass 4mp) accelerated through a potential difference of 150V,
R: a proton whose linear momentum is equal to that of particle P.
Which one of the following correctly ranks their de Broglie wavelengths in descending order?
a) λQ>λP=λR
b) λP>λR>λQ
c) λP=λR>λQ
d) λQ>λR>λP