Questions
The minimum light intensity that can be perceived by the eye is about 10-10 W /m2 .The number of photons of wavelength
5.6 x10-7 m that must enter the pupil of are 10-6m2 per sec for vision is approximately (use h =6.6x10-34 Joule -sec)
detailed solution
Correct option is A
Given that I=10−10W/m2=10−10Js−1m−2 Let the number of photons required be n. Then nhv10−6=10−10 or n=10−6×10−10hv or n=10−16λhc =10−16×5⋅6×10−76⋅62×10−343×108=3×102 photonsTalk to our academic expert!
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When a point light source, of power E emitting monochromatic light of wavelength is kept at a distance r from a photosensitive surface of work -function and area s, then number of photons striking the surface per unit time is
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