Questions
Light with an average flux of 20 falls on a non-reflecting surface at normal incidence having surface area 20 . The energy received by the surface during time span of 1 minute is:
detailed solution
Correct option is B
E=Intensity x surface area x time =20×104×20×10−4×60=24×103JTalk 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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