An object in the sky brightens suddenly, but shows no hydrogen lines in its spectrum. It is most likely a(n):
A) comet.
B) type I supernova.
C) type II supernova.
D) asteroid impact.
E) stellar collision.
B
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Venus has a significant magnetic field
a. True b. False Indicate whether the statement is true or false
What factors are important when trying to classify a spiral galaxy?
a. amount of dust and gas in the galaxy b. structure of the spiral arms c. size of the central region d. All of the other choices are important.
What is the orbital angular momentum quantum number for a d subshell?
A. 10 B. 7 C. 4 D. 3 E. 2
A uranium nucleus (mass 238 units) at rest decays into a helium nucleus (mass 4.0 units) and a thorium nucleus (mass 234 units). If the speed of the helium nucleus is 5.5 × 10^5 m/s, what is the speed of the thorium nucleus?
a. 9.4E+3 m/s b. 3.2E+7 m/s c. 3.4E+3 m/s d. 9.4E+7 m/s e. 1.9E–1 m/s