Enrgy = hc/wavelength =
find energy per photon = (6.626x10^-34 x 3 x 10^8)/ 589 x 10^-9 = 3.74 x 10^-19Joules divide total energy by the energy of each 609000 Joules / 3.74 x 10^-19Joules =1.80 X 10(24) photons
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