Doppler shift of sound. Frequency unmoved: 400Hz. Frequency far away, approaching: 440Hz. Frequency far away, leaving: 360Hz. Relative velocity compared to speed of sound: 0.1. Nearest distance to observer: middle.
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{{Information |Description = Doppler shift of sound. Frequency unmoved: 400Hz. Frequency far away, approaching: 440Hz. Frequency far away, leaving: 360Hz. Relative velocity compared to speed of sound: 0.1. Nearest distance to observer: middle. |Source = o