can someone teach me plz

light falling on a photosensitive metal surface causes it to emit electrons whose energy is such that a potential of 5.25 V is required to stop them .
a) calculate the maximum kinetic energy of the electron.
B) determine their velocity?

Question

can someone teach me plz

light falling on a photosensitive metal surface causes it to emit electrons whose energy is such that a potential of 5.25 V is required to stop them .
a) calculate the maximum kinetic energy of the electron.
B) determine their velocity?

anonymous · Answer

Maximum kinetic energy = e * stopping potential
You can use the relation above to solve question a. And then use
kinetic energy = 1/2 * mass * velocity^2
to work out the maximum velocity.