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Answer the following statement true (T) or false (F)
False
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Two cars, one in front of the other, are traveling down the highway at 25 m/s. The car behind sounds its horn, which has a frequency of 540 Hz. What is the frequency heard by the driver of the lead car? (vsound = 340 m/s)
a. 463 Hz c. 579 Hz b. 540 Hz d. 500 Hz
Energy Density: The maximum magnetic energy density of a sinusoidal electromagnetic wave is 8.95 × 10-5 J/m3. What is the amplitude of the magnetic field component of this wave? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A. 12.0 ?T B. 13.0 ?T C. 14.0 ?T D. 15.0 ?T E. 16.0 ?T
The superposition of two waves, 
and 
,results in a wave with a frequency of
A. 85 Hz. B. 170 Hz. C. 85? Hz. D. 340 Hz. E. 170? Hz.
Magnetic fields are produced by
a. constant electric currents. b. electric currents that vary sinusoidally with time. c. time-varying electric fields. d. all of the above. e. only (a) and (b) above.