The star Algol is
a. an astrometric binary.
b. a spectroscopic binary.
c. a visual binary.
d. an eclipsing binary.
e. a spectroscopic binary and an eclipsing binary.
e
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If originally there were X atoms of radioactive isotope present and now there are only X/2 atoms, how many half-lives have elapsed?
A) 3 B) 1 C) 4 D) 2
Why is the greenhouse effect weaker on Mars than on Earth or Venus?
A. High water vapor clouds reduce the amount of sunlight that reaches the planet's surface. B. There is no carbon dioxide in Mars's atmosphere. C. Mars's atmosphere is much thinner than those of Venus and Earth. D. Fog and frost on the Martian surface reflect much of the Sun's energy.
How does Earth's varying distance from the Sun affect our seasons?
A) It doesn't—Earth's orbital distance plays no significant role in the seasons.
B) It causes the seasons to be more extreme than they would be if the Earth's distance from the Sun were always the same.
C) It makes summer warmer in the Northern Hemisphere than in the Southern Hemisphere.
D) It is responsible for the fact that the seasons are opposite in the Northern and Southern hemispheres.
A 22-?F capacitor is connected across a 120 V (rms) 60 Hz source. What is the peak current in this case?
A) 0 B) 1.0 A C) 10.0 A D) 0.10 A E) 1.4 A