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Q.

Suppose $10^{- 17} J$ of light energy is needed by the interior of the human eye to see an object. How many photons of green light $(λ = 550 n m)$ are needed to generate this minimum amount of energy?

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answer is 28.

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Detailed Solution

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The energy needed to see object = $10^{- 17} J$
Photon energy used to see object = $\frac{h c}{λ}$
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