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Q.

Suppose 10−17 J of energy is needed by the interior of human eye to see in an object. How many photons of green light (1 = 550 nm) are needed to generate this minimum amount of energy ?

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a

14

b

28

c

39

d

42

answer is B.

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Detailed Solution

Let the number of photons required be n.E =nhCλnhcλ=10−17 n=10−17 ×λhc= 10−17 × 550 × 10−96.626 × 10−34 × 3 × 108=27.6 ≃ 28 photons

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Suppose 10−17 J of energy is needed by the interior of human eye to see in an object. How many photons of green light (1 = 550 nm) are needed to generate this minimum amount of energy ?