TELESCOPES (javascript version)

1. Telescope A's mirror has three times the diameter of telescope B's. How much greater is A's light-gathering power?
A 3 times.
B6 times
C 8 times.
D9 times
E27 times.

2. A telescope's resolving power measures its ability to see
Afainter sources. east.
B more distant sources.
Cfiner details in sources.
Dlarger sources.
Emore rapidly moving sources.

3. A ground-based telescope to observe x-rays would
A be a powerful tool for studying abnormally cold stars or distant planets.
B give astronomers the chance to study the insides of stars and planets.
C be worthless because no astronomical objects emit x-rays.
D be worthless because x-rays can not pass through the Earth's atmosphere.
E be worthless because astronomers have not yet devised detectors for x-rays.

4. Astronomers use interferometers to
A observe extremely dim sources.
B measure the speed of remote objects.
C etect radiation that otherwise cannot pass through our atmosphere.
D enhance the resolving power (see fine details) in sources..
E measure accurately the composition of sources.

5. One way to increase the resolving power of a telescope is to
A make its mirror bigger.
B make its mirror smaller.
C replace its mirror with a lens of the same diameter.
D use a mirror made of gold.
E observe objects using longer wavelengths..

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