A car traveling due North at a4.1 m/s. A bicycist benind the car is traveling at 18.3 mis in the same dırection. The dniver of Hthe car blows her horn at 739 Hz. What frequency does the bicyclist hear? Sound Speed in air : 341 mis
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.
Given
Speed of the car is
Speed of the bicyclist is
Frequency of the source is
Speed of sound in air is
Formula
From Doppler's effect we get the frequency heard by the bicyclist as .........................(1)
Here both the observer and the source are moving and the observer moving behind the source.
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