A proton and an -particle start from rest in a uniform electric field. The ratio of times taken by them to travel the same distance in the field is

Step-by-step solution

Acceleration of -particle, a_r= q E m = 2 e E 4 Acceleration of photon, a_p= e E 1 They travel same distances in time t₁ and t₂ . 1 2 ( 2 e E 4 ) t₁^2= 1 2 ( e E 1 ) t₂^2 t₂^2 t₁^2 = 1 2 t₂ t₁ = 1 2