Question 1

There is a surprisingly small variation among stellar

Accepted Answer

A)  temperatures.
B)  diameters.
C)  densities.
D)  masses.

Question 2

What keeps light from escaping from a black hole is its

Accepted Answer

A)  strong electric field.
B)  strong magnetic field.
C)  strong gravitational field.
D)  absorbing atmosphere.

Question 3

At the end of its period in the main sequence, a star whose mass is near that of the sun

Accepted Answer

A)  breaks up into several smaller stars.
B)  cools down into a white dwarf.
C)  expands into a red giant.
D)  explodes into a supernova.

Question 4

In the HR diagram, most stars are

Accepted Answer

A)  members of the main sequence.
B)  red giants.
C)  white dwarfs.
D)  scattered at random.

Question 5

Most stars have hot interiors surrounded by relatively cool atmospheres.The spectrum of such a star consists of

Accepted Answer

A)  white lines against a dark background.
B)  colored lines against a dark background.
C)  dark lines against a white background.
D)  dark lines against a colored background.

Question 6

The main sequence on the HR diagram includes

Accepted Answer

A)  the sun.
B)  white dwarfs.
C)  red giants.
D)  pulsars.

Question 7

At the end of its period in the main sequence, a very heavy star

Accepted Answer

A)  breaks up into several smaller stars.
B)  cools down into a white dwarf.
C)  expands into a red giant.
D)  explodes into a supernova.

Question 8

White dwarfs are stars that are

Accepted Answer

A)  at the beginning of their life cycles.
B)  in the middle of their life cycles.
C)  at the end of their life cycles.
D)  Any of these choices are correct.

Question 9

Stars whose intrinsic brightness and period of variation are related are called

Accepted Answer

A)  pulsars.
B)  Cepheid variables.
C)  main-sequence stars.
D)  red giants.

Question 10

The spectrum of a star can provide information of which one or more of the following?

Accepted Answer

A)  the star's magnetic field
B)  the star's temperature
C)  the star's relative motion toward or away from us
D)  the star's composition
E)  All of the above

Question 11

The source of the sun's energy is

Accepted Answer

A)  radioactivity.
B)  nuclear fission.
C)  nuclear fusion.
D)  combustion.

Exam 18: The Stars

What keeps light from escaping from a black hole is its

Correct Answer
verified

At the end of its period in the main sequence, a very heavy star

Correct Answer
verified

White dwarfs are stars that are

Correct Answer
verified

At the end of its period in the main sequence, a star whose mass is near that of the sun

Correct Answer
verified

In the HR diagram, most stars are

Correct Answer
verified

The source of the sun's energy is

Correct Answer
verified

Stars whose intrinsic brightness and period of variation are related are called

Correct Answer
verified

The main sequence on the HR diagram includes

Correct Answer
verified

The spectrum of a star can provide information of which one or more of the following?

Correct Answer
verified

There is a surprisingly small variation among stellar

Correct Answer
verified

Most stars have hot interiors surrounded by relatively cool atmospheres.The spectrum of such a star consists of

Correct Answer
verified

Exam 18: The Stars

What keeps light from escaping from a black hole is its

Correct AnswerverifiedShow Answer

At the end of its period in the main sequence, a very heavy star

Correct AnswerverifiedShow Answer

White dwarfs are stars that are

Correct AnswerverifiedShow Answer

At the end of its period in the main sequence, a star whose mass is near that of the sun

Correct AnswerverifiedShow Answer

In the HR diagram, most stars are

Correct AnswerverifiedShow Answer

The source of the sun's energy is

Correct AnswerverifiedShow Answer

Stars whose intrinsic brightness and period of variation are related are called

Correct AnswerverifiedShow Answer

The main sequence on the HR diagram includes

Correct AnswerverifiedShow Answer

The spectrum of a star can provide information of which one or more of the following?

Correct AnswerverifiedShow Answer

There is a surprisingly small variation among stellar

Correct AnswerverifiedShow Answer

Most stars have hot interiors surrounded by relatively cool atmospheres.The spectrum of such a star consists of

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified