A proton and an α - particle, having kinetic energies Kp and Kα respectively, enter into a magnetic field at right angles. The ratio of the radii of trajectory of proton to that of α - particle is 2 : 1. The ratio of Kp:Kα is:

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

4 : 1

8 : 1

1 : 4

1 : 8

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Radius of a particle in the magnetic field is r=mvBq=2mKEBqKE=P22mGiven : rp;rα=2:1 then ⇒rprα=21=mpkpmαkα×qαqp=14kpkα×21⇒KpKα=41

Watch 3-min video & get full concept clarity