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  #1  
Old 10-21-2008, 09:41 AM
LMarshall
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Question hertz to joules?

Can anyone tell me how do u convert hertz to joules?
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  #2  
Old 10-21-2008, 09:56 AM
JohnS JohnS is offline
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Default Re: hertz to joules?

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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.
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Old 10-22-2009, 04:55 PM
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Angry Re: hertz to joules?

(Person above me) how does your explanation answer the question?
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  #4  
Old 10-22-2009, 05:07 PM
JohnS JohnS is offline
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Default Re: hertz to joules?

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

thanks a direct answer^
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