While you are sounding a tone on a toy whistle, you notice a friend running toward you. If you want her to hear the same frequency that you hear even though she is approaching, you must
a. stay put.
b. run towards her at the same speed.
c. run away from her at the same speed.
d. stay put and play a note of higher frequency.
e. run towards her and play a note of higher frequency.
c
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________ is the concept that the universe looks the same in all directions
Fill in the blank(s) with correct word
What is the resonant frequency of a 1.0
F capacitor and 15 mH coil in series?
A. 15 kHz B. 1.3 kHz C. 0.87 kHz D. 57 kHz
A beam of light of wavelength 674 nm is incident along the normal to two closely spaced parallel glass plates. For what air gap separation between the plates will the transmitted beam be of maximum intensity? (1 nm = 10?9 m)
a. 169 nm b. 674 nm c. 337 nm d. 843 nm e. 506 nm
The event horizon of a black hole is:
a) the distance at which a star is torn apart by tidal forces b) the minimum distance from which light can escape c) the distance at which a human body is torn apart by tidal forces d) the distance from which we can see inside the black hole e) the point of infinite density.