Verifying Duane-Hunt Relation

  • Thread starter saiyaex
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Homework Statement


Just going over some practice questions, and one of them is:

1. Verify the value of the constant, 1240, in the Duane-Hunt relation.


Homework Equations


E(eV) = 1240/lambda(nm)


The Attempt at a Solution


I know it is used as a quick method in finding how much energy is involved when a molecule absorbs a photon of light. I therefore know how to use it in a question. However, I'm stumped as to verifying the actual value of the constant. Any insight is appreciated!
 

Answers and Replies

  • #2
collinsmark
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Look up the definition of Planck's constant, or more specifically what is called the "Planck relation" or the "Planck–Einstein equation". It relates the energy of a photon to the photon's frequency (or wavelength).

A few other things you may need to know.

  • What is the speed of light in a vacuum (in [m/sec])?
  • What is Planck's constant (in [J sec])?
  • If you know the frequency of a photon, what is the photon's wavelength?
  • How many Joules are there in one electron-volt?
  • how many nanometers are there in a meter?
 

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