Finding Maximum kinetic energy of ejected electrons

  • Thread starter pleace
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Homework Statement


So i know the light colour, wavelength, cutoff potential and frequencies. im trying to find the maximum kinetic energy of the ejected electrons(J or eV)
heres the first set of numbers for the colour of yellow:
wavelength 578nm(5.78 x 10 to the -7metres). cutoff potential 0.25v. Frequency= 5.19 x 10 to the 14 HZ

Homework Equations


E= hc/λ


The Attempt at a Solution


so i started to think that i was supposed to use the equation e=hc/λ. but it is not getting me the right answer. i think this might be because the "E" is just total energy and not kinetic, but i have no idea what to do. Please help
 

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