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Q.

The energy flux of sunlight reaching the surface of the earth is 1.388 × 103  w/m2. 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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a

3.8 × 1020

b

3.8 × 1021

c

3.8 × 1022

d

3.8 × 1023

answer is B.

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Detailed Solution

detailed_solution_thumbnail

 Power of sunlight per m2=P=1.388×103W/m2

 Average λ=550×10−9m

 Let n be no. of photons per m2 incident on earth per second. 

P=nE;E=hc/λ⇒n=3.84×1021 photons /m2/s

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