An electron with an initial speed of 6.00×105 m/s is brought to rest by an electric field. what was the potential difference that stopped the electron? what was the initial kinetic energy of the electron, in electron volts?

As we know that electrostatic potential difference is used to stop the moving electron

So here kinetic energy of electron is converted into electrostatic potential energy

so we will first find the kinetic energy of moving electron as

now we have

now from above formula we have

now to convert kinetic energy into electron volt we know that

so we have

now from energy conservation change in electrostatic potential energy is given as

so it is stopped by 1.02 Volts potential difference

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