Tom Donaly wrote:
John Popelish wrote:

Tom Donaly wrote:

How many photons does it take to make a Watt?



1/(Hz*6.63*10^-34).

The lower the frequency the less energy per photon.


That's joules per second, is it?

A watt is a joule per second. The formula gives the number of photons
per second that carry a watt (or a joule per second) once you provide
the Hz (frequency).

By the way, I am having second thoughts as to whether or not there
should be a 2*pi factor in there, since most physics formulas deal
with frequency in radians per second, not cycles per second. But the
photon energy formulas usually deal with wavelength, and I have never
seen one that assumes a wavelength is a radian of a cycle, rather that
a full cycle, so, perhaps Hz is the correct unit.

If anyone can clear this up for me, I would appreciate it.