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How to calculate threshold frequency of a metal

  • #1

Homework Statement


Determine the threshold frequency of a metal with a work function of 7V


Homework Equations


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


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?
 

Answers and Replies

  • #2
NascentOxygen
Staff Emeritus
Science Advisor
9,244
1,071
With one photon liberating one electron, you should convert from Joules per coulomb, to Joules per electron.
 

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