An extremely large collection of stars bound together by gravitational attraction and occupying a huge volume of space is called a _______________
a. planetary nebula
b. solar system
c. universe
d. galaxy
d
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Astronomers have discovered more planets around other stars than in our Solar System
Indicate whether the statement is true or false
In a laser
a. light is amplified by stimulated emission of radiation b. the emitted light is monochromatic c. the emitted light is coherent d. there is a population inversion of electrons in atoms e. all of the above
In most months, there are no eclipses
a. True b. False Indicate whether the statement is true or false
The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be 3 times the change in length of the Pyrex glass rod
a. True b. False Indicate whether the statement is true or false