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When a proton is accelerated through \( 1 \, \text{V} \), then its kinetic energy will be

1. 1840 eV
2. 13.6 eV
3. 1 eV
4. 0.54 eV

Correct answer: 1 eV

Solution

When a proton is accelerated through a potential difference of 1 V, it gains an energy equal to the charge of the proton (1 elementary charge) multiplied by the potential difference. This equals 1 eV, as 1 eV is defined as the energy gained by a charge of 1e when accelerated through 1 V.

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