First slide

Electrostatic potential energy

Question

How much kinetic energy will be gained by an $α -$ particle in going from a point at 70 V to another point at 50V

Moderate

A

$40 eV$
B

$40 keV$
C

$40 MeV$
D

$0 eV$

Solution

$KE = q (V_{1} - V_{2}) = 2 \times 1 .6 \times 10^{- 19} \times (70 - 50) = 40 eV$

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