Question

electron and alpha particle are accelerated through same potential difference enter at 90° then ratio of their radii is​

Answer 1

α particle will be helium nucleus of

charge 2e and mass 4u

Proton will be hydrogen of

charge 1e and mass 1u

Radius of circle of charged particle in magnetic field will be

r=

qB

mv

By Lorentz force,

Radius=

charge×magneticfield

momentum

We know that radius is inversely proportional to charge

So Radius of alpha particle will be half of radius of proton

Hence ratio of Radii =1:2