Monday
October 20, 2014

Homework Help: Physics

Posted by hannah on Saturday, February 11, 2012 at 8:30am.

In black-and-white photography, a photon energy of about 4.00 x 10-19 J is needed to bring
about the changes in the silver compounds used in the film. (a) What is the frequency of the
light needed to bring about these changes? (b)
Explain why a red light used in a darkroom does not affect the film during developing.

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