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#1
10-21-2008, 09:41 AM
 LMarshall Guest Posts: n/a
hertz to joules?

Can anyone tell me how do u convert hertz to joules?
#2
10-21-2008, 09:56 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,533 Rep Power: 19
Re: hertz to joules?

Quote:
 Originally Posted by LMarshall Can anyone tell me how do u convert hertz to joules?
Electromagnetic energy has a dual nature, both particle and wave. Which nature is revealed depends on the wavelength (or frequency) vs the scale of matter it is reacting with. At higher energies (shorter wavelengths, higher frequency), the particle nature is more evident and each photon has a discrete energy:

E = h*nu, or
E = h*c/lambda
where E is the photon energy
h = Plank's constant
nu is the frequency
lambda is wavelength.

In SI units, h is expressed in joules, although it is also commonly expressed in electron volts. Infrared radiation of approximately 1240 nm has an energy of 1 electron volt.

3 electron volts corresponds to blue light of 413 nm, and 4 eV is getting to be nasty UV of 310 nm. 5 eV will break O2 bonds and form ozone.
#3
10-22-2009, 04:55 PM
 Unregistered Guest Posts: n/a
Re: hertz to joules?

#4
10-22-2009, 05:07 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,533 Rep Power: 19
Re: hertz to joules?

Quote:
 Originally Posted by Unregistered (Person above me) how does your explanation answer the question?
Multiply the frequency of the photon by Planck's constant.
#5
07-19-2013, 10:51 AM
 Unregistered Guest Posts: n/a
Re: hertz to joules?

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