Solar radiation falls on the earth at the rate of 1.94 cal/(cm² min) on a surface normal to the incoming rays. Assuming that the average wavelength of radiation is 5500 Angstroms, compute:
a. the frequency of the radiation in 1/s.
b. the wavenumber of the radiation in 1/cm
c. the energy of a single photon of the radiation in Joules
d. how many photons hit 1 cm² area in a sec?
