Dual Nature Of Radiation And Matter Ques 64
64. Kinetic energy of an electron, which is accelerated in a potential difference of $100$ $ V$ is
[1995]
(a) $1.6 \times 10^{-17}$ $ J$
(b) $1.6 \times 10^{-19}$ $ J$
(c) $1.6 \times 10^{-21}$ $ J$
(d) $1.6 \times 10^{-25}$ $ J$
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Answer:
Correct Answer: 64.(a)
Solution:
- (a) Potential difference $(V)=100 $ $V$. The kinetic energy of an electron $=1 $ $eV=1 \times(1.6 \times 10^{-19})$ $=1.6 \times 10^{-19}$ $ J$.
Therefore kinetic energy in $100$ volts $=(1.6 \times 10^{-19}) \times 100=1.6 \times 10^{-17}$ $ J$.
$K.E.$ $=qV$
$=1.6 \times 10^{-19} \times 100 $ $J=1.6 \times 10^{-17}$
BETA
