Sound is a(n)
a. longitudinal wave.
b. electromagnetic wave.
c. transverse wave.
d. standing wave.
a
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If the intensity of an electromagnetic wave is 80 MW/m2, what is the amplitude of the magnetic field of this wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 0.82 mT B) 0.33 µT C) 10 T D) 14 T E) 0.58 mT
Why is it easier to travel to a remote viewing site with an 8" Cassegrain than an 8" Newtonian reflector?
What will be an ideal response?
The Copernican (heliocentric) model explained things better than the Ptolemaic (geocentric) model, except:
a. it did not explain the relative positions of stars as seen from Earth at different times of year. b. it did not explain why Mercury is always near the Sun. c. it was conceptually more complex than the Ptolemaic model. d. it did not explain planetary motion clearly. e. it required a great deal more mathematical calculation.
Earth spins completely upright like a giant top
a. True b. False Indicate whether the statement is true or false