Isaac Physics Stress

I need some help with D6.4 Isaac Physics, please!!

Calculate the maximum speed of the photoelectrons emitted when a material with an 8.4×10^−20
J work function is illuminated by light of frequency 7.0×10^14 Hz.

Any support would be appreciated, thanks. ☺️

Reply 1

tweetybiiiiird20

Original post by username6544237

know that the energy of a photon is hf
Excess energy of a photoelectron is the energy of a photon subtracted by the work function of the metal
This excess energy of the electron is equal to the maximum kinetic energy of the emitted photoelectron.
You know the mass of en electron so rearrange and solve for the speed