At rest, a car’s horn sounds the note A (220 Hz). The horn is sounded while the car is moving down a street at 20.0 m/s and passing a bicyclist moving in the same direction. Assume that the bicyclist moves at a uniform velocity of 10.0 m/s. (a) What frequency does the cyclist hear when the car is behind him? (b) What frequency does the cyclist hear after the car passes him? (The speed of sound in air is 340 m/s.)
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.
At rest, a car’s horn sounds the note A (220 Hz). The horn is sounded while the car is
moving down a street at 20.0 m/s and passing a bicyclist moving in the same
direction. Assume that the bicyclist moves at a uniform velocity of 10.0 m/s. (a)
What frequency does the cyclist hear when the car is behind him? (b) What frequency
does the cyclist hear after the car passes him? (The speed of sound in air is 340 m/s.)
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