Two speakers are driven exactly out of phase with each other at 256 Hz. If a microphone is placed on the line between the two speakers exactly in the middle of the line, what is possibly the distance between the microphone and each speaker? The speed of sound is 340 m/s.
A. 0.75 m
B. 0.38 m
C. Can be any distance at all
D. 1.50 m
E. 0.94 m
C. Can be any distance at all
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Two marbles are rolling along parallel tracks (which may or may not be inclined). A stroboscopic photograph showing a top view of the positions of the marbles at equally spaced instants of time looks like this: At what instant(s) of time do the marbles have the same instantaneous velocity?
A. At time tB
B. At time tG
C. At both tB and tG
D. Some instant between tC and tD
E. Some instant between tD and tE
F. Roughly time tD
The temperature at which water freezes is the same as the temperature at which
A) ice melts. B) water boils. C) both of these D) neither of these
Interference: Two light sources are said to be coherent if they are
A. of the same frequency. B. of the same frequency, and maintain a constant phase difference. C. of the same amplitude, and maintain a constant phase difference. D. of the same frequency and amplitude.
Answer the following statement(s) true (T) or false (F)
1. A quanton moving in a system whose V (x) is given by the box potential energy function can never be unbound, no matter what its total energy might be. 2. An electron moving near a proton can never be unbound, no matter what its energy might be.