![]() So there is a drop in pitch of 26 Hz as the fire engine passes and begins to move away. The terms in the brackets become a factor to multiply the source frequency. Wave crest 1 was emitted when the source was at position S4, crest 2 at position S2, and so forth. (b) The source S now moves toward observer A and away from observer C. The observed frequency f o ( o for observer ) can be calculated if the frequency of the source f s ( s for source ), the speed of the source v s and the speed of sound v are known. (a) A source, S, makes waves whose numbered crests (1, 2, 3, and 4) wash over a stationary observer. As a result the waves arrive at the observer less frequently. As each complete sound wave is emitted, the distance has increased between the source and observer.
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