Answers are in blue.

1. Which of the following colors of light has the most energetic photons?

a. Blue.
b. Red.
c. Infrared.
d. Ultraviolet.
e. Orange.

2. c = lambda nu. What's nu?

a. Frequency.
b. Period.
c. Speed.
d. Index of refraction.
e. None of the above.

3. What prevents a large ground-based telescope from reaching its theoretical resolution?

a. Bubbles in the glass.
b. Small defects in the figure of the mirror.
c. Greenhouse gasses.
d. Atmospheric turbulence.
e. None of the above.

4. A blackbody ...

a. Absorbs all light at all wavelengths.
b. Emits perfectly at all wavelengths.
c. Can be characterized by a single temperature.
d. All of the above.
e. None of the above.

5. At what wavelength does the emission from the Sun peak?

a. Visible.
b. Thermal infrared.
c. Far infrared.
d. Radio.
e. None of the above.

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Last modified 11 October, 2006. © Gregory C. Sloan.