POLICE On Highway 900, a police vehicle with its siren emitting frequency f = 1,785 Hz is chasing a getaway car. Both are travelling at the same speed, v. = 40.00 m/s, as they cross under an overpass. Driving away from the overpass the driver of the getaway car hears the siren directly at frequency f, and also hears a wave reflected from the overpass at frequency f. What is the frequency f, which the driver in the getaway car will hear? Take the speed of the sound to be 344 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.
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