Download Review Quiz No. 17

Review Quiz
No. 17
Question 1:
What is the “TurnOff Point”?
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The radius in the interior of a star where fusion
processes can no longer take place.
The point in time of a star’s life when nuclear fusion of
hydrogen into helium ceases.
The point in time of a star’s life when nuclear fusion
processes cease alltogether.
The point in a rotating star cluster beyond which a star is
no longer gravitationally bound to the cluster.
The point on the main sequence of a star cluster above
which stars have evolved to red giants.
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Question 2:
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Comparing the Hertzsprung-Russell
diagrams of 2 star clusters, A and B,
you find that the turn-off point of cluster
A occurs in the range of F stars, while
that of cluster B occurs in the range of
K stars. From this, you can infer that …
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A is closer to us than B.
B is closer to us than A.
A is older than B.
B is older than A.
A contains more stars
than B.
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Question 3:
The longer a Cepheid
variable’s oscillation
period, …
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the brighter (more luminous) it is.
the fainter (more luminous) it is.
the longer its rotation period is.
the shorter its rotation period is.
the younger it is.
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Question 4:
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Cepheid variables can be
used for distance
measurements …
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only within the solar system.
only in the immediate solar
neighborhood
only within our Milky Way.
to neighboring galaxies.
throughout the entire visible
Universe.
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