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Question

A photographic film is coated with a silver bromide layer. When light falls on this film, silver bromide molecules dissociate and the film records the light there. A minimum of 0.6e V is needed to dissociated a silver bromide molecule. Find the maximum wavelength of light that can be recorded by the film.

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Solution

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Correct option is
A

2071



For to be min becomes maximum.
The wok function is given as:
 

or

Substitute the values in above expression.

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