Question: When both the source and observer are stationary, compare the frequency of the sound detected by the observer and the frequency of the sound emitted

When both the source and observer are stationary, compare the frequency of the sound detected by the observer and the frequency of the sound emitted by the source. The observer detects a frequency less than the source frequency. The observer detects a frequency greater than the source frequency. The observer detects a frequency equal to the source frequency

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