While a variety of factors can produce redshifts in the spectrum, the one associated with the expansion of the universe is called:
A) universal.
B) cosmological.
C) olberian.
D) relativistic.
E) the Zeeman Effect.
B
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Why do astronomers believe that galactic collisions cause active galactic nuclei?
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What causes the outward gas pressure that balances the inward pull of gravity in a main-sequence star?
a. the rapid outward flow of gas b. the rapid inward flow of the gas c. the high temperature of the gas d. the high density of the gas e. the high temperature and the high density of the gas
Defining momentum as ?mv Einstein was able to show
A. that different observers may not agree on the values of velocities or momenta, but they still find that momentum is conserved. B. that different observers could then obtain the same values of velocities and momenta, and thus show that momentum is conserved. C. that momentum is not conserved at speeds near light speed.
A microscope has an objective lens of focal length 1.4 mm and an eyepiece of focal length 20 mm, adjusted for minimum eyestrain. A blood sample is placed 1.5 mm from the objective
How far apart are the lenses? A) 20 mm B) 21 mm C) 23 mm D) 33 mm E) 41 mm