What are the units for spectral energy density according to the Planck Law?

In summary, spectral energy density is a measure of the energy per unit frequency or wavelength in an electromagnetic radiation field. It can be measured using various units and is specifically used to analyze and understand electromagnetic radiation in fields such as astronomy and spectroscopy. Spectral energy density can be converted to other units, but it is important to use the appropriate units for the specific type of radiation being measured.
  • #1
Fr34k
20
0
I will just paste the link, cause its faster this way:

http://scienceworld.wolfram.com/physics/PlanckLaw.html

The last equation for spectral energy density if you look at the units you get eVs/m^3 or Js/m^3, yet energy density is supposed to be J/m^3. What am I missing here?
 
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  • #2
It is a density per frequency (and space). To get the total (spatial) energy density, you have to integrate over the whole frequency range (0 to infinity).
 

FAQ: What are the units for spectral energy density according to the Planck Law?

What is spectral energy density?

Spectral energy density is a measure of the amount of energy per unit frequency or wavelength in a given electromagnetic radiation field.

How is spectral energy density measured?

Spectral energy density can be measured using a variety of units, such as watts per hertz (W/Hz) or joules per nanometer (J/nm).

What is the difference between spectral energy density and energy density?

Spectral energy density specifically refers to the energy contained in a specific frequency or wavelength range, while energy density is a more general measure of energy per unit volume.

How is spectral energy density used in scientific research?

Spectral energy density is used in a variety of fields, including astronomy, atmospheric sciences, and spectroscopy, to analyze and understand electromagnetic radiation and its properties.

Can spectral energy density be converted to other units?

Yes, spectral energy density units can be converted to other units using standard conversion factors. However, it is important to use the appropriate units for the specific type of electromagnetic radiation being measured.

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