A car that is about to enter a tunnel and is moving at a top speed of 50.0 [kph]. To signal that the car is coming, the car driver blows a horn, producing a sound of some frequency. At that time, the temperature of the air is about 20.0°C. What is the speed of sound in air at this temperature? If the sound is reflected back by a wall at the opening of the tunnel, what is the ratio of the incident frequency and the received frequency heard by the car driver?

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A car that is about to enter a tunnel and is moving at a
top speed of 50.0 [kph]. To signal that the car is
coming, the car driver blows a horn, producing a sound
of some frequency. At that time, the temperature of the
air is about 20.0°C. What is the speed of sound in air at
this temperature? If the sound is reflected back by a
wall at the opening of the tunnel, what is the ratio of the
incident frequency and the received frequency heard
by the car driver?
Transcribed Image Text:A car that is about to enter a tunnel and is moving at a top speed of 50.0 [kph]. To signal that the car is coming, the car driver blows a horn, producing a sound of some frequency. At that time, the temperature of the air is about 20.0°C. What is the speed of sound in air at this temperature? If the sound is reflected back by a wall at the opening of the tunnel, what is the ratio of the incident frequency and the received frequency heard by the car driver?
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