Three particles are prepared as follows: P: an electron given of kinetic energy, Q:…
PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation
Problem
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