Answer:
When the electron is moving with
velocity \[\upsilon \], its mass is given as \[(m)=\frac{{{m}_{0}}}{{{\left(
1-\frac{{{\upsilon }^{2}}}{{{c}^{2}}} \right)}^{1/2}}}\]
Here \[{{m}_{0}}=\] rest mass of the
electron. If \[\upsilon =c,\] then
\[m=\frac{{{m}_{0}}}{{{\left(
1-\frac{{{c}^{2}}}{{{c}^{2}}}
\right)}^{1/2}}}\,=\frac{{{m}_{0}}}{{{(1-1)}^{1/2}}}\,=\frac{{{m}_{0}}}{0}\] or
\[m=\infty \]
Thus, the mass of electron moving with
velocity of light is infinity.
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