While sitting next to a road on a calm, warm 27.9ºC evening, you see an ambulance's lights flashing in the distance coming towards you. You hear a frequency of 140 Hz. However, you know that ambulances have sirens that emit sound at 130 Hz. How fast is the ambulance approaching you, in m/s?

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Interference of sound

Seiche

A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.