Far from their source, electromagnetic waves are
A)
elliptical waves.
B)
longitudinal waves.
C)
plane waves.
D)
spherical waves.
E)
circular waves.
C
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Indicate whether the statement is true or false
Comparing Mercury to the Earth's Moon:
A. Mercury is more than 100 times the mass of Earth's Moon. B. Mercury is only about 1/100th the mass of Earth's Moon C. they both take the same time to complete one orbit around the Sun. D. they both have little atmosphere and a similarly cratered surface. E. Since Mercury has so many active volcanoes, the craters on its surface have almost all been wiped away, while the Moon's craters remain.
The emphasis of the orange-and-apple sequence in your textbook is
A) defining systems. B) actions equal reactions. C) forces produce accelerations. D) friction is a force. E) mass is not a force.
What are cosmic rays?
A) another name for gamma rays and X-rays B) fast moving dust particles in the interstellar medium C) subatomic particles that travel close to the speed of light D) lasers used as weapons by extraterrestrials