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Question: 1 the sun irradiates the earth at a rate of...

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1) The sun irradiates the Earth at a rate of 1.94 cal/cm 2min, assuming normal incidence. For λ-5500 Å, how many photons per cm min. does that correspond to? (1cal - 4.184 J) 2) a) The threshold frequency for the photoelectric effect of Na is 4.39x101 Hz. Calculate the corresponding energy in eV, and the wavelength in nm. What region of the EM spectrum does the photon belong to? b) The threshold energy for the photoelectric effect of K is 2.1 eV. Calculate the corresponding frequency in Hz, and the wavelength in nm. What region of the EM spectrum does this photon belong to?

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