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The energy flux of sunlight reaching the surface of the earth is 1.388xx10^(3)W//m^(2). How many photons(nearly) per square metre are incident on the earth per second? Assume that the photons in the sunlight have an average wavelength of 550 nm. |
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Answer» SOLUTION :`E=1.388xx10^(3)WM^(-2), lambda=550nm=550xx10^(-9)m` `E=NH upsilon="nh"(c )/(lambda), n=(Elambda)/(hc)= (1.388xx10^(3)xx550xx10^(-9))/(6.63xx10^(-34)xx3xx10^(8))=3.8xx10^(21)" photon"//m^(2)//s` |
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