Question

The kinetic energy of a proton after it accelerates from rest through a potential difference of 80 V is (in eV).

96 eV

80 eV

560 eV

248 eV

160 eV

Answer 1

The proton has the same electric charge as the electron, with an opposite sign (proton +, electron -). We know that the energy gained by accelerating through a potential field is given by:

Here, this energy will be Kinetic Energy of the proton:

We also know that 1 eV = 1.6 * 10^-19 J

So, from both the expressions, we can say that the Kinetic energy of the proton = 80 eV

PLEASE RATE IF YOU LIKE IT.