2 11 When the sun is directly overhead the surface of the

Last updated: 6/4/2023

2 11 When the sun is directly overhead the surface of the earth receives 14 x 10 W m2 of sunlight Assume that the light is monochromatic with average wavelength 500 nm and that no light is absorbed in between the sun and the earth s surface The distance between the sun and the earth is 1 5x 10 m a Calculate the number of photons falling per second on each square metre of earth s surface directly below the sun b How many photons are there in each cubic metre near the earth s surface at any instant c How many photons does the sun emit per second