February 27, 2017

Homework Help: Science

Posted by Margaret on Monday, October 8, 2012 at 2:14am.

In black and white photography, a photon energy of about 4.00 x 10 to the negative 19th power I is needed to bring about the changes in the silver compounds used in the film. Explain why a red light used in a darkroom does not affect the film during developing.

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