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Question
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 nm) are needed to generate this minimum amount of energy?
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 nm) are needed to generate this minimum amount of energy?
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Solution
The correct option is B 28
E=nhcλ
⇒10−17=n×6.625×10−34×3×108550×10−9
⇒n=27.67≈28
E=nhcλ
⇒10−17=n×6.625×10−34×3×108550×10−9
⇒n=27.67≈28
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