Detailed measurements of the disk and central bulge region of our Galaxy suggest our Milky Way is a
A) dwarf galaxy.
B) spiral galaxy.
C) very flat elliptical galaxy.
D) very dusty irregular galaxy.
E) quasar.
B
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In the round-the-world experiment described in problem R4T.2, what is the minimum accuracy over the experiment’s duration that the clocks must have to clearly display the relativistic effect?
A. Both clocks must be accurate to the nearest 10 ms. B. Both clocks must be accurate to the nearest 10 ?s. C. Both clocks must be accurate to the nearest 10 ns. D. Both clocks must be accurate to the nearest 10 ps.
What two things are needed to create an emission nebulae?
A) interstellar gas and dust B) hydrogen fusion and helium ionization C) cool stars and much interstellar dust D) hot stars and interstellar gas, particularly hydrogen E) hydrogen gas and carbon dust
White light is spread out into spectral hues by a diffraction grating. If the grating has 1000 lines per cm, at what angle will red light (? = 640 nm) appear in first order?
A. 14.7° B. 7.35° C. 17.7° D. 3.67° E. 1.84°
What effect does the formation of sea ice in polar regions have on the density of seawater?
What will be an ideal response?