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let 10^-16 J of light energy is required by the interior of human eye to see an object. The number of photons of green light (ý=550)needed to see the object are approximately equal to
Asked by ssolaimuthu9 | 09 Jul, 2022, 02:00: PM
answered-by-expert Expert Answer
Dear Student,
 

Energy of n photons = nhc / λ

Where,

h= 6.626 ˟ 10−34 J.s

c=3˟ 108 m/s

λ=550 nm=550×10−9m

n=number of photons

Energy of n photons = n × 6.626×10−34×3×108 / 550×10−9

Number of photons (n) = 10−16×550×10−9 / 6.626×10-34×3×108

n = 27.67 ≈ 28 photons

Answered by | 10 Jul, 2022, 11:31: AM
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