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Grade 12Modern Physics

A monochromatic beam of light (lamda=4900 A) incident normally up on a surface produces a pressure of 5x10^7N/m^2 on it.Assuming that 25% of the incident light is reflected and the rest absorbed.Find the number of photons falling per second on a unit area of thin surface???

Profile image of M.vs vivek vardhan
15 Years agoGrade 12
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1 Answer

Profile image of Arun Kumar
12 Years ago
Hello
P_absorb=E_(intensity)/c
P_reflect=2E_(intensity)/c
E_(intensity)=n*hc/lambda per unit area
we can get n from here
Thanks & Regards
Arun Kumar
Btech, IIT Delhi
Askiitians Faculty

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