| if a source of sound moves, the frequency of the sound waves it propagates gets modified and the sound will be perceived at a pitch either higher (when the source is approaching) or lower (when it is going away) than the original one |
when the sound emitted by a fixed source hits a surface it is reflected and echoed at the same frequency however, if it is reflected by a moving surface, its frequency will be modified |
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| the source itself is moving Click on "go" to start | the source is fixed; the sound is reflected by either a fixed or a moving surface (blood) Click on "go" to start |