Question

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

• A. $40eV$
• B. $40keV$
• C. $40MeV$
• D. $0eV$

Answer 1

Answer: (A)

$40eV$

Answer 2

$KE = q(V_{1} - V_{2}) = 2 \times 1.6 \times 10^{- 19} \times (70 - 50) = 40eV$