Question

A proton and an alpha particle are accelerated to the same potential. Their de-broglie wavelengths are in the ratio of

Answer 1

As alpha particles contain 2 proton and 2 neutrons it's mass number is 4

And by the relation of de broglie wavelength we know that mass is directly proportional so the ratio will be 1:4 for proton:alpha paricle ratio

Hope you get the answer

For the formula of de broglie wavelength refer your school book