The Doppler shift for electromagnetic radiation from distant galaxies moving toward the observer is called a:
a. vacuum shift.
c. red shift.
b. blue shift.
d. black shift.
B
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The image formed by a diverging lens of a real object is always
A. Smaller than the object B. Inverted C. Larger than the object D. Virtual E. Real
In astronomy, an interferometer can be used to:
A) yield better seeing conditions with optical telescopes. B) decrease the effects of light pollution in getting darker sky backgrounds. C) improve the angular resolution of radio telescopes. D) increase the sensitivity of infrared telescopes to longer wavelengths. E) speed up the processing of CCD images.
The Chandrasekhar mass limit is
A) .08 solar masses. B) .4 solar masses. C) 1.4 solar masses. D) 3 solar masses. E) 8 solar masses.
If one of the caissons of the Falkirk Wheel contained a sunken boat, resting on its bottom, and the other carried a floating boat, the wheel balance would
A) still be maintained. B) be upset and more energy would be needed for operation. C) render the machine useless. D) violate Archimedes' principle.