On its icy surface, Uranus' satellite Ariel has smooth valleys with few craters. Other areas are rough with many craters. Based on this, it can be concluded that
a. valleys are young and the rough areas are old
b. the valleys are old and the rough areas are young
c. both valleys and rough areas are young
d. both valleys and rough areas are old
A
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Where would you be if the Sun sets for six continuous months, beginning on September 23rd?
A) North Pole B) Arctic Circle C) Equator D) Antarctic Circle E) South Pole
The frequency of a light beam is doubled. Which one of the following is correct for the momentum of the photons in that beam of light?
A) It stays the same. B) It is halved. C) It is doubled. D) It is reduced by one-fourth E) It is quadrupled.
Of the three types of nuclear decay, only __________ does not affect the atomic number of the nucleus
Fill in the blank(s) with correct word