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The speed of sound increases with temperature. It is 331 m/s in air at 0°C and 343 m/s in air at 20°C. A hollow glass pipe vibrates with a frequency of 151 Hz.
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The driver of an ambulance turns on its siren as the ambulance heads east at 30 mph. A police car is following the ambulance at 30 mph. A truck behind the police car is moving at 20 mph. A van is traveling west in the opposite lane at 20 mph. A small car is stopped at the side of the road. The vehicles are positioned as shown.
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A 330 Hz tuning fork is vibrating after being struck. It is placed on a table near but not directly touching other objects, including other tuning forks. Eventually one glass and one other tuning fork start vibrating.
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The first harmonic in a pipe closed at one end is 487 Hz.
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The first harmonic in a pipe open on both ends is 487 Hz.