If the distance to the nearest star is 4.2 light-years, then
a. the star is 4.2 million AU away.
b. the light we see left the star 4.2 years ago.
c. the star must have formed 4.2 billion years ago.
d. the star must be very young.
e. the star must be very old.
B
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Indicate whether the statement is true or false
A lightbulb is connected to a 120 V(rms), 60 Hz source. How many times per second does the current reverse directions?
A. 60 B. 130 C. 120 D. 30
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a. are more common in close pairs of galaxies than in isolated systems. b. emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. c. generally show redshifts greater than 6. d. are more common in close pairs of galaxies than in isolated systems and emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. e. are more common in close pairs of galaxies than in isolated systems; emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies; and generally show redshifts greater than 6.
According to the Pauli Exclusion Principle for n = 4, the occupation limit of electrons is
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