Question
Question: The mass of a particle is 400 times than that of an electron and the charge is double. The particle ...
The mass of a particle is 400 times than that of an electron and the charge is double. The particle is accelerated by 5 V. Initially the particle remained in rest, then its final kinetic energy will be –
A
5 eV
B
10 eV
C
100 eV
D
2000 eV
Answer
10 eV
Explanation
Solution
W = qDV = K.Ef – K.Ei ŗ 0
K.Ef = qDV = (2e)DV = 2e × 5 = 10 eV