a
I = Io co^2 d
= 3.2 w/m^2 x cos^2 33 = 2.30 w/m^2
b
frequency = c/ wavelength = 3 x10^8 m/s / (680 x 10^(-9) m) = 0.004 x 10^17 = 4.00 x 10^14 Hz
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