A train is moving parallel to a highway with a constant speed of 15.0 m/s. A car is traveling in the same direction as the train with a speed of 20.0 m/s. The car horn sounds at a frequency of 480 Hz, and the train whistle sounds at a frequency of 330 Hz. (a) When the car is behind the train, what frequency does an occupant of the car observe for the train whistle? (b) After the car passes and is in front of the train, what frequency does a train passenger observe for the car horn?
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
A train is moving parallel to a highway with a constant speed of 15.0 m/s. A car is traveling in the
same direction as the train with a speed of 20.0 m/s. The car horn sounds at a frequency of 480 Hz, and the train whistle sounds at a frequency of 330 Hz. (a) When the car is behind the train,
what frequency does an occupant of the car observe for the train whistle? (b) After the car
passes and is in front of the train, what frequency does a train passenger observe for the car
horn?
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