Homework Help: Physics

Posted by Marium on Tuesday, May 18, 2010 at 11:12pm.

Electrons are ejected from a photoelectric cell with a maximum kinetic energy of 1.20 eV. If the incident light has a wavelength of 410nm, what is the work funtion?

Physics - drwls, Tuesday, May 18, 2010 at 11:17pm
e*(Phi) = h*c/(lambda) - (max K.E.)
= photon energy - (max electron energy)

Solve for the work function phi, in electron volts

h is Planck's constant
Physics - Marium, Wednesday, May 19, 2010 at 12:33am
yes that is what i did..and the answer i got is 2.93 x 10^-19 .. but i think its wrong :S
Physics - drwls, Wednesday, May 19, 2010 at 1:36am
Your answer is in Joules. The work function is always given in electron volts (or just "volts"). Divide your number by e, the electron charge, to get phi, the work function.
Physics - Marium, Wednesday, May 19, 2010 at 2:55pm
oh okay thank u =)

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