How to calculate threshold frequency of a metal


by Justin Hawk
Tags: frequency, metal, threshold
Justin Hawk
Justin Hawk is offline
#1
Oct31-11, 06:20 AM
P: 12
1. The problem statement, all variables and given/known data
Determine the threshold frequency of a metal with a work function of 7V


2. Relevant equations
Threshold frequency 'f'=W/h where w=work function, h=planck's constant


3. The attempt at a solution
This is such an easy question, but I am hung up on how to treat a work function that is expressed in volts seeming as the equation used to calculate the frequency requires it to be in joules I believe. I understand that volts can be expressed as joules per coulomb, but what would I do about the coulombs then?
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NascentOxygen
NascentOxygen is offline
#2
Oct31-11, 09:37 AM
HW Helper
P: 4,708
With one photon liberating one electron, you should convert from Joules per coulomb, to Joules per electron.


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