Question

Speed of electron, if it possesses 60 eV energy.

Answer 1

Given that,

Energy = 60 eV

We need to calculate the speed of electron

Using formula of energy

$E=\dfrac{1}{2}mv^2$

Where, m = mass of electron

v = speed of electron

Put the value into the formula

$60 \times1.6\times10^{-19}=\dfrac{1}{2}\times9.1\times10^{-31}\times v^2$

$v^2=\dfrac{2\times60\times1.6\times10^{-19}}{9.1\times10^{-31}}$

$v=\sqrt{\dfrac{2\times60\times1.6\times10^{-19}}{9.1\times10^{-31}}}$

$v=4593354.0\ m/s$

$v=4.59\times10^{6}\ m/s$

Hence, The speed of electron is $4.59\times10^{6}\ m/s$