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- 1. Multiple Choice
Which of the following give off infrared radiation?
people
light bulbs
stars
teletubbies
a heated / glowing stovetop burner
- 2. Multiple Choice
Not counting reflected light, which of the following give off visible radiation (they are luminous objects)?
people
light bulbs
stars
a heated / glowing stovetop burner
a desk
- 3. Multiple Choice
(Q5) If you pointed an ULTRAVIOLET sensor at the sun, would you be able to detect it? (Does the sun produces UVenergy?)
Yes, that is why we get sunburns.
No.
- 4. Multiple Choice
(Q9) As a blackbody, what wavelength of radiation does a low-temperature star (~4000 degrees) give off? Where is the peak of electromagnetic energy it gives off?
Infrared radiation
ultraviolet light
gamma rays
visible light
- 5. Multiple Choice
(Q13d) Who do are incandescent light bulbs (the ones with the glowing filament) considered to be wasteful?
They are intended to give off visible light, but they actually create a large amount of heat (infrared radiation).
They are intended to create heat, but they actually create a large amount of light (visible radiation) which is really annoying. Turn off the lights please!
- 6. Multiple Choice
(Q14g) We see the earth by reflected light, but we don't see the earth glowing except at a few spots where there is an active volcano. Why is this?
The surface of the Earth is not hot enough to give off visible light (only infrared), but it is hot enough on the inside.
The surface of the Earth is overpowered by the light coming from the Sun, which makes it hard to see it glowing.
The Earth is producing large amounts of ultraviolet light, which we cannot see (but can sense with our skin).
- 7. Multiple Choice
A blackbody curve on a graph tells us how an object releases
radio waves according to Planck's constant.
light through a black hole's event horizon.
radiation over different frequencies.
heat over time.
- 8. Multiple Choice
Blackbody curves also tell astronomers about the ___ of an object (like a star).
rotational energy
temperature
distance
composition
- 9. Multiple Choice
As you heat up a blackbody radiator, it changes color from...
ultraviolet to blue to white to yellow to orange to red to infrared
ultraviolet to infrared to red to orange to yellow to white to blue
infrared to red to orange to yellow to white to blue to ultraviolet
red to orange to yellow to white to blue to infrared to ultraviolet
- 10. Multiple Choice
What color would this object glow if it were heated to 5,000 K?
Green
Yellow
Red
Infrared
- 11. Multiple Choice
What happens to the color this object is glowing with as it cools down from 5,000 K?
It goes from yellow to white to blue.
It goes from yellow to orange to red.
It goes from infrared to white to blue.
It goes from ultraviolet to infrared to red.
- 12. Multiple ChoiceWhat is infrared radiation?The circulation of a fluid caused by heating it.Transfer of heat inside a metal.Heat energy transfer by electromagnetic wavesTransfer of light energy
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