For which of the following will the phenomenon of wave interference apply? (Choose the best answer.)
1.square-shaped pulses
2.sinusoidal pulses
3.triangular pulses
4.all of these
4
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Semiconductors: In a good conductor, the highest energy band containing electrons is
A. only partially filled. B. completely filled. C. completely empty.
Which Big Bang "puzzles" does the inflationary model resolve?
A. The cosmic background radiation is smooth, but the distribution of matter in the Universe is lumpy. B. The energy of expansion is almost exactly equal to the collective gravitational force between galaxies. C. The Universe is all ordinary matter with almost no antimatter. D. All of these choices are correct.
When a spring is stretched, its mass decreases
Indicate whether the statement is true or false
Which of the following is not generally used in mineral identification?
a. Size b. Cleavage c. Specific gravity d. Color