On a bright sunny day, the irradiance on the surface of the ocean is 1.6*10^17 photons cm^-2 s^-1. If k=0.02 m^-1
a)How much light is left at 15 m?
b)at 75 m?
a)How much light is left at 15 m?
b)at 75 m?
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I assume decay is of the form
I(z) = Io e^-(k z)
I(z) = 1.6*10^17 e^-(.02 z)
for example at 15 m
I(15) = 1.6*10^17 e^-(.02*15)
=1.6*10^17 * .741
= 1.2*10^17
do the same for z = 75