The Attempt at a Solution
de Broglie wavelength λ of a particle = h /P
a) since mass of proton is more than electron and speed is same , momentum of proton is more . De Broglie wavelength of proton will be less .
b) wavelengths will be same .
c) Using P = √(2Km) . Since energy is same and mass of proton is more , it's momentum will be more . Hence wavelength of proton will be less .
Is that correct ?
I would like to know whether I should have used the relation E2 = P2c2 + m02c4 ?
When is the above relation valid ? Is it only when the particles are moving at the speed of light ?
I am not sure when are we supposed to use the above relation . Should we use the above relation or using P = √(2Km) was okay ?