Which of the following statements is true of reflection nebulae?
A) They have a distinctive blue color.
B) The gases in reflection nebulae are excited to emit photons.
C) The spectrum of a reflection nebula is not the reflected absorption spectrum of starlight.
D) They are produced when a hot star excites the gas to produce an emission spectrum.
A
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The electric potential at a distance d from a point charge is V. At a distance d’, the potential is 2V. What is the ratio of electric field at d’ to that at d?
A. 4 B. more information is necessary C. 2 D. 1?2 E. 1?4
What feature of Einstein's theory of relativity is demonstrated by the phenomenon of matter-antimatter annihilation?
A) the relativity of mass B) the constancy of lightspeed C) E = mc2 D) the relativity of time E) that too much television will give you gas pains and make you froth at the mouth
The most heavily utilized Aquifer in North America
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If the bright star Sirius transits my local meridian tonight at 6:43 PM, when will it transit tomorrow?
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