An electron starts from rest in a vacuum, in a region of strong electric field.

Question

An electron starts from rest in a vacuum, in a region of strong electric field. The electron moves through a potential difference of 99 V. What is the kinetic energy of the electron in electron volts (eV)? ev What would happen if the particle were a proton? The proton would have equal kinetic energy but would be moving in the opposite direction. The proton would have less kinetic energy, and would be moving in the opposite direction. The proton would have greater kinetic energy, and would be moving in the same direction. The proton's motion would be identical to that of the electron.

Explanation / Answer

Work done = Change in Kinetic energy

qV = KEf - KEi

KEf = qV = (-1.61*10^-19 ) (-99 ) J = 99 eV

if the particle will be proton

Then

=> The proton would have less kinetic energy, and would be moving in the opposite direction.

will be correct

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