Umakant biswal
Last Activity: 8 Years ago
@ sridhar
u can use the following formula to get the right answer .,
f = bq / 2m pie
no need of potential and proton energy .
by solving u will get
2vmev = ½ m v square
u will get v from their
20 kv = v / 4 pie efsilon not r
HOPE IT CLEARS
ALL THE BEST ..