What causes the image of an object in water when the observer is in air to appear closer than it is?
A. Diffraction
B. Refraction
C. Interference
D. Reflection
Ans: B. Refraction
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Which of the following statements comparing open and globular star clusters is true?
A) Stars in open clusters are relatively young, while stars in globular clusters are very old. B) Open clusters are found both in the disk and the halo of the galaxy, while globular clusters are found only in the halo. C) Globular clusters typically contain a few hundred stars, while open clusters typically contain tens to hundreds of thousands of stars. D) Open clusters contain only main-sequence stars, while globular clusters contain only giants.
Our nearest stellar neighbor is a little less than 1 parsec away
Indicate whether the statement is true or false
A 0.5-kg blob of clay moving at 2.0 m/s slams into a 4.0-kg blob of clay at rest. The speed of the two blobs stuck together after colliding is about
A) 1.1 m/s. B) 1.5 m/s. C) 2.5 m/s. D) none of the above
Globular clusters are used as spiral tracers
a. True b. False Indicate whether the statement is true or false