If the de Broglie wavelengths associated with a proton and an α-particle are equal, then the ratio of velocities of the proton and the α-particle will be:
1:4
2:1
4:1
1:2
Solution:
The correct option is C 4:1 Given de Broglie Wavelength λp=λα So, h/mp × vp = h/mα × vα vp/vα = mα/mp = 4mp/mp Because Mass of α particle is 4 times mass of proton. So 4:1. Option C is correct answer