February 21, 2017

Homework Help: Chemistry

Posted by Shaniquaa on Sunday, December 7, 2008 at 2:58pm.

When light of a wavelength of 125 nm strikes a certain metal, electrons having a velocity of 8.2 x 10^5 m/s are
emitted from the surface of the metal. What is the threshold frequency of the metal?
The answer is 1.9 x 10^15 s^-1
I'm not sure how to do this. The equations that I tried to use were E=1/2mv^2, E=hf-hf0, E=hc/lamda but it didn't work

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