An electron of mass \( 9.11\times10^{-31}\,\mathrm{kg} \) is moving with velocity \( 5.4\times10^{6}\,\mathrm{m/s} \). Its momentum will be
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → \( 4.92\times10^{-24}\,\mathrm{kg\,m/s} \)
The speed is far below the speed of light (non-relativistic motion), so the momentum is simply mass times velocity.
\( \displaystyle p = m v = 9.11\times10^{-31}\,\mathrm{kg} \times 5.4\times10^{6}\,\mathrm{m/s} \)
\( \displaystyle p = 49.19\times10^{-25} \approx 4.92\times10^{-24}\,\mathrm{kg\,m/s} \)