Suppose an observer and a source of sound are both at rest and a strong wind is blowing away from the source toward the observer. (i) What effect does the wind have on the observed frequency? (a) It causes an increase. (b) It causes a decrease. (c) It causes no change. (ii) What effect does the wind have on the observed wavelength? Choose from the same possibilities. (iii) What effect does the wind have on the observed speed of the wave? Choose from the same possibilities.
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