Given:
The potential difference applied to an electron is V = 531 V
The magnitude of the charge on an electron is

The mass of the electron is

To find the percentage of the speed of light with the speed of an electron.
Step-by-step explanation:
The speed can be calculated by the formula

On substituting the values, the speed will be

The percentage of the speed of light with the speed of the electron is

Thus, the percentage of the speed of light with the speed of the electron is 4.567%