Question 1:

A blackbody emits EM radiation in a characteristic spectrum. The amount of energy emitted per area by the body, and the range of wavelengths at which the energy is emitted is determined by the object's

100%	1.	temperature
0%	2.	volume
0%	3.	pressure
0%	4.	density

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Question 2:

A hot star has a surface temperature of 9500 K. At what wavelength is the energy vs. wavelength spectrum peaked for this star?

0%	1.	5.0 x 10^-7 m
100%	2.	3.1 x 10^-7 m
0%	3.	2.5 x 10^-5 m
0%	4.	7.0 x 10^-7 m

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Question 3:

If an object's blackbody spectrum is peaked at 1 x 10^-4 m, what is it's temperature?

0%	1.	2900 K
0%	2.	5800 K
0%	3.	290 K
100%	4.	29 K

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Question 4:

The sun's blackbody spectrum is peaked in visible spectrum at blue-green light, so we see all the colors equally from the sun, so that its light looks white. What color would a star appear to be if the temperature were such that the spectrum peaked at wavelengths shorter than those of the visible spectrum?

100%	1.	Blue-violet
0%	2.	Red-orange
0 %	3.	White
0%	4.	Yellow-green

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Question 5:

What is the power per area emitted by a blackbody at 9500 K?

0%	1.	5.4 x 10^-4 W /m^2
0%	2.	64 MW /m^2
100%	3.	462 MW / m^2
0%	4.	8.15 x 10^15 W / m^2

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Question 6:

What component of our atmosphere is most responsible for the absorption of IR radiation from the sun?

0%	1.	carbon dioxide (CO2)
100%	2.	water (H2O)
0%	3.	ozone (O3)
0%	4.	methane(CH4)

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Question 7:

From the map of solar insolation provided in the lecture notes or from the one in your text, which part of the country receives the highest insolation?

100%	1.	southwest
0%	2.	midwest
0%	3.	southeast
0%	4.	northwest

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Question 8:

For a region where the insolation in December on a tilted surface is 1400 Btu/ft^2-day, what is minimum collection area I would need to supply 200,000 Btu per day?

0%	1.	70 ft^2
0%	2.	550 ft^2
100%	3.	143 ft^2
0%	4.	none of the above

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Question 9:

If a set of flat plates is 50% efficient at collecting the sun's radiation, by what factor must the area of my collection system change, relative to a 100% efficient system?

100%	1.	2 x bigger
0%	2.	« x bigger
0%	3.	3/4 x bigger
0%	4.	50 x bigger

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Question 10:

In order to store 100,000 Btu's of heat in 1000 pounds of water, by how much should the temperature of the water rise?

100%	1.	100 F
0%	2.	100 C
0%	3.	90 F
0%	4.	1000 F

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