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Multiple Choice Quiz
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1

An astronomical unit is:
A)the distance between the sun and Earth
B)the distance between the Earth and the moon
C)the angle between opposite sides of the sun
D)the angle between the sun and the nearest star
2

Which of the following is a characteristic of a terrestrial planet?
A)mean density of about 5000 kg per cubic meter
B)location in the outer solar system
C)diameter of at least 100,000 km
D)extensive methane-ammonia atmosphere
3

Suppose there are 100 grams of an isotope which has a half-life of 10 minutes. How much of the isotope will be left after 30 minutes?
A)50 grams
B)0 grams
C)25 grams
D)12.5 grams
4

If a body emits light be blackbody radiation, there is a unique correspondence between
A)the temperature of the object and the wavelength at which it is brightest
B)the temperature of an object and its surface area
C)the mass of the object and the power radiated
D)the mass of the object and its surface temperature
5

Suppose a blackbody is brightest at a wavelength of one micron. If the temperature of the blackbody is doubled, at what wavelength would it be brightest?
A)two microns
B)one micron
C)0.5 microns
D)1.2 microns
6

Blackbodies A and B have the same size. A is three times as hot as B. What is the ratio of the rate of energy emitted by A to the rate of energy emitted by B?
A)3
B)9
C)27
D)81
7

Pluto is now 30 times farther from the sun than is the Earth. How much fainter would the sun appear from Pluto than from Earth?
A)30 times
B)300 times
C)90 times
D)900 times
8

The energy transport process in which heated material rises and cooled material sinks is
A)conduction
B)convection
C)radiation
D)radial drift
9

A planet has an albedo of 0.4. What percentage of the sunlight which strikes the planet is absorbed by the planet?
A)60%
B)40%
C)100%
D)cannot be calculated from the information given
10

Which of the following planets is most likely to retain a thick atmosphere?
A)a planet with a hot atmosphere, low gravity
B)a planet with a hot atmosphere, high gravity
C)a planet with a cool atmosphere, low gravity
D)a planet with a cool atmosphere, high gravity





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