The intensity of sunlight hitting the earth is about 1300 W/m2. If sunlight strikes a perfect...
The intensity of sunlight hitting the earth is about 1300 W/m2. If sunlight strikes a perfect absorber, what pressure does it exert? How about a perfect reflector? What fraction of atmospheric pressure does this amount to?
Homework Answers
The expression for the pressure in case of a perfect absorber is as follows:
Here, I is intensity, c is speed of light, and P is pressure.
The expression for the pressure in case of a perfect reflector is as follows:
Here, I is intensity, c is speed of light, and P’ is pressure.
Now, substitute 
for I and 
for c in the equation 
.
Then, substitute 
for I and 
for c in the equation 
.
The atmospheric pressure is equal to,
The fraction for the perfect absorber is as follows:
Hence, the fraction for perfect absorber is 
.
The fraction for the perfect reflector is as follows:
Hence, the fraction for perfect reflector is 
.
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