How much kinetic energy will be gained by an $\alpha - $particle in going from a point at $70\,V$ to another point at $50\,V$
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(a) $KE = q({V_1} - {V_2}) = 2 \times 1.6 \times {10^{ - 19}} \times (70 - 50) = 40\,eV$
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