What force(s) are responsible for the collapse of an interstellar cloud?
a. nuclear
b. gravity
c. electric
d. magnetic
e. electric and magnetic
b
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One of the harmonics of a column of air open at both ends has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column?
A) 32 Hz B) 64 Hz C) 88 Hz D) 128 Hz E) 256 Hz
Herschel's original disk model placed us close to the center of the Galaxy
Indicate whether the statement is true or false
What is the hardness of diamond on the Mohs scale?
a. 1 b. 4 c. 7 d. 10
This photo shows a single star photographed by the Hubble Space Telescope. Why doesn't the star appear as a single, sharp point of light?
A) The wave properties of light make this type of blurring an unavoidable feature of any telescope. B) We are seeing a planetary system around the star. C) The image of the star is overexposed. D) The telescope was not properly focused when it took this photo.