The pattern of sound waves emitted by a source is shown in the picture above. Th

Question

The pattern of sound waves emitted by a source is shown in the picture above. The source is the small dot at the instant shown in the picture, the source is located on at x = ?1 m, y = 0. At rest, the source emits a frequency of f. The speed of sound is 345 m/s. The small black rectangle in the picture represents an observer. (b) Using the information shown in the picture, determine the velocity of the source. (The positive direction is to the right. Indicate the direction with the sign of your answer.)

Explanation / Answer

The vertical spacing of the circles is 1m, thus the circles are

emitted 1/345s apart. After 5 of these intervals, the source has moved 2m horizontally, for a velocity of

2 ( 345/5) = 138 m/s

The velocity of the ource is 138 m/s

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