On Tue, 04 May 2010 12:08:28 -0700, Jim Lux
wrote:

That is, if you wanted to get the energy between 350 and 600 nm, then
you'd use the energy/nm

OTOH, if you wanted to integrate between 470 THz and 800THz, you'd use
energy/Hz.

The units would cancel unless that is your intent - but I am still
stymied by what is being sought by these elaborations.


they "should" come out with the same answer (especially in the limit of
actual integration with respect to d(nu) or d(lambda)).

Hence my question about the significance of changing domains when
either integration must, ultimately, come to the same thing in power.
None of this is currently being expressed in energy (a term being
commingled with power), which for optoelectronics would be eV.

This would raise a curious representation of a third domain with
re-rigging the wavelength/frequency scale into the appropriate energy
scale of eV vs. power. The solar radiation spectrum would thus span
(left to right) 5eV to 0.5eV.

Where is this leading?

73's
Richard Clark, KB7QHC