The energy flux of sunlight reaching the surface of the earth is 1.388 × 10 3 W m –2 …
Physics · Class 12 · CBSE — Dual Nature of Radiation & Matter
The energy flux of sunlight reaching the surface of the earth is 1.388 × 103 W m–2. The photons in the sunlight have an average wavelength of 550 nm. How many photons per square metre are incident on the earth per second ?
- 4 × 1021
- 4 × 1034
- 4 × 1031
- 4 × 1028
Answer
(A) 4 × 10 21
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