Question 6 A car comes towards a stationary observer at speed 72.00 km/hr, honking loudly, and passes by. The pitch (frequency) of the sound heard changes. Here is an example video of a car approaching and passing by. (Warningl It is a LOUD video.) Take the speed of sound in air as 340.0 m/s. Part A - Stationary observer listening By how much does the pitch go down (find the ratio of the frequency as the car gets away to the frequency as it is approaching). Part B - Wedding day convoy Now imagine that other cars are following the honking car with the same speed, 72.00 km/hr. What is the ratio of the frequency heard by the following cars, if the frequency of the honk is 160 Part C- Police car catching up Now imagine a police car is trying to catch the honking car. It comes from behind with a speed of 144.0 km/hr. What is the frequency of the sound heard by the police o Please write your answer up to four significant digits for this part of the question, MyLab will only accept up to 0.1% rounding error in this part.
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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