Monday

April 21, 2014

April 21, 2014

Posted by **A 75- light source consumes 75 of electrical power. Assume all this energy goes into emitted light** on Friday, October 21, 2011 at 10:32am.

- physics -
**drwls**, Friday, October 21, 2011 at 11:03am(a) frequency = c/(wavelength)

(b) 75 W/(h*f)

where f it the frequency and h is Plank's constant.

(c) certainly not. Frequency does not depend upon brightness. Photons per second does.

- physics -
**drwls**, Friday, October 21, 2011 at 12:44pmBy the way, your "posted by" name is an incorrect statement, which disagrees with the facts and the question itself. What is that all about?

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