Talk-radio station KOOK is at approximately 90 megahertz on the radio dial. This means that KOOK broadcasts
A) an electromagnetic wave whose frequency is 90 vibrations/second.
B) an electromagnetic wave whose frequency is 90 × 106 vibrations/second.
C) an electromagnetic wave whose wavelength is 90 × 106 vibrations per second.
D) a sound wave whose frequency is 90 × 106 vibrations/second.
E) a sound wave whose frequency is 90 vibrations/second.
B
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In China tonight the Moon phase is first quarter, so tonight for you the Moon phase is ______
a. waxing gibbous b. first quarter c. new d. waxing crescent
After the first solid grains formed in our solar system, these particles could then grow by the process of ____________, the collision and sticking of one particle with another to continue the formation of planetesimals. Each of these has many atoms or molecules
a. accretion b. sublimation c. hydration d. condensation e. vaporization
How does the differentiation process generate heat?
A. As low-density rock rises to the surface, it carries heat from the interior of the planet. B. As dense material sinks through less dense rock, it generates heat through friction. C. Iron and nickel accumulating at the center of the planet concentrate the planet's heat. D. Heat is generated by the constant bombardment of the planet by planetesimals.
Which space mission is searching for extrasolar planets using the astrometric method?
A) Kepler B) GAIA C) CoRoT D) Spitzer