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A green leaf has a surface area of 2.40 cm2 . If solar radiation is 1110...

A green leaf has a surface area of 2.40 cm2 . If solar radiation is 1110 W/m2 , how many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504 nm for solar radiation.

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Answer #1

P = I* A
   =1110 W/m^2 * (2.4*10^-4 m^2)
   =0.2664 W

energy of 1 photon = h*c/lambda
E = (6.626*10^-34)*(3*10^8) /(504*10^-9)
   =3.944*10^-19 J

Number of photon = 0.2664 / (3.944*10^-19 )
                                        =6.75*10^17 photon

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