Which of the following would you expect to be very common in globular clusters?

A) high-mass main-sequence stars
B) low-mass main-sequence stars
C) supernova remnants
D) x-ray binaries
E) supergiant stars


B) low-mass main-sequence stars

Physics & Space Science

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What is the main optical element of a refractor telescope?

A. lens. B. mirror. C. combination of many small plane mirrors. D. prism of glass.

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A spaceship, moving toward the Earth at a speed of 0.9c, shines a green laser at Earth. An observer on Earth would see the light arriving at a speed of

A. 1.9c and with a shorter wavelength. B. c but at a shorter wavelength. C. 0.1c and with an inverted frequency. D. c but at a smaller frequency. E. more than c but less than 1.9c.

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During a single period, the distance traveled by a wave is

A) one-half wavelength. B) one wavelength. C) two wavelengths. D) more information is needed

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The fact that one side of the Moon always faces Earth is evidence that while revolving about the Earth it

A) does not rotate about its axis. B) rotates about its axis.

Physics & Space Science