The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is:
A) a continuum, strongest in the color red.
B) a few bright lines against a dark background.
C) a few dark lines in the continuum.
D) a continuum, but with both bright and dark lines mixed in.
E) not in the visible portion of the spectrum.
B
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Energy transport by ____________________ is important when photons cannot readily travel through a gas
Fill in the blank(s) with correct word
If you see Al going to your left at exactly 0.99c and Bob going to your right at exactly 0.99c, Al will say that Bob is
A) going away from her at 1.98c. B) going away from her at exactly 0.99c. C) going away from her at exactly c. D) going away from her at about 0.98c. E) going away from her faster than 0.99c, but slower than c.
Each edge of a cube has a length of 50.8 cm. What is the length of a diagonal of the cube going through the center of the cube?
a. 20.0 in c. 34.6 in b. 28.8 in d. 50.8 in
Two moons orbit a planet in circular orbits. Moon A has orbital radius R, and moon B has orbital radius 4R. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?
A) 20 days B) 80 days C) 160 days D) 320 days E) 5 days