On the Sun, what takes approximately 22 years to happen?
A) The Sun takes that time to rotate on its axis.
B) The complete sunspot cycle, including magnetic field reversals.
C) Solar vibrations begin every 22 years.
D) Solar activities goes from its maximum to minimum.
E) The corona reaches its maximum temperature and ejects gas every 22 years.
B
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If every star had an Earth-like planet in an Earth-like orbit, how many could be detected by a transit?
A) 1 in 2 B) 1 in 20 C) 1 in 200 D) 1 in 2,000 E) 1 in 20,000
Which of the above illustrations shows a neutral aqueous solution?
A) A B) B C) C D) All of the above are neutral solutions. E) none of the above
What are the mass number A and the charge (in units of e) for each of the following particles or rays? (a) beta-plus (b) beta-minus (c) gamma ray
What will be an ideal response?
With current technology, the Doppler method can be used to measure stellar motions that are as small as about
A) walking speed. B) the speed at which continents move with plate tectonics. C) the speed of cars on a freeway (with no traffic). D) the cruising speed of an airplane. E) the orbital speed of Jupiter.