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QUESTION
In black-and-white photography, a photon energy of about 4.00 10 19 J is needed to bring about the changes in the silver compounds used in the film.
× 10−19
J 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.
The minimum or maximum
(select)minimummaximumenergy of a red-light photon is much
more or less?
(select)morelessthan the energy
required to bring about the changes in the silver compounds.
