Harmonics
a. are components of a complex waveform.
b. have frequencies that are integer multiples of the frequency of the complex waveform.
c. are pure tones.
d. have sinusoidal waveforms.
e. all of the above
e
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Helium fusion is called the triple-alpha process because
a. the helium nucleus is known as an alpha particle. b. it occurs very rapidly. c. it requires a temperature three times greater than that of hydrogen fusion. d. it is the third source of the primary fusion processes. e. each reaction produces three carbon nuclei.
Magnetic Field of a Long Wire: A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line produces at the ground, 10 m away? (?0 = 4? × 10-7 T ? m/A)
A. 4.7 µT B. 6.4 µT C. 20 µT D. 56 µT
When a magnetic field causes a charged particle to move in a circular path, the only quantity listed below which the magnetic force changes significantly as the particle goes around in a circle is the particle's:
a. energy. c. momentum. b. time to go around the circle once. d. radius for the circle.
How does the mass of a giant star compare with the mass of the black hole it may become? How do the densities compare?
What will be an ideal response?