An electron of mass Me initially at rest moves through a certain distance in a uniform electric field in time t1. A proton of mass Mp also initially at rest takes time t2 to move thro equal distance in uniform electric field E. t2/t1 is equal to?
a) sqrt(Me/Mp ) b)sqrt(Mp/Me)
c)Me/Mp d)Mp/Me

Question

An electron of mass Me initially at rest moves through a certain distance in a uniform electric field in time t1. A proton of mass Mp also initially at rest takes time t2 to move thro equal distance in uniform electric field E. t2/t1 is equal to?
a) sqrt(Me/Mp  )      b)sqrt(Mp/Me) 
c)Me/Mp     d)Mp/Me

ujjwal · Answer

F=ma
or, eE=ma
or, a=eE/m
Now use formula S=1/2 at^2 (starting from rest)
solve further (keeping S same for both proton and electron and time t1 and t2 respectively)..
Option (a) is correct answer..

anonymous · Answer

hey..yeah even i got the same thing. thanks.:D