You are driving west on a highway at 2o m/sec. A police car is traveling toward you moving east. The police siren is blaring loudly and your perfect pitch identifies the tone frequency as 600 HZ but you know that the standard siren frequency is 500 HZ. (use 340 m/sec
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.
You are driving west on a highway at 2o m/sec. A police car is traveling toward you moving east. The police siren is blaring loudly and your perfect pitch identifies the tone frequency as 600 HZ but you know that the standard siren frequency is 500 HZ. (use 340 m/sec as the speed of sound in the air)
How fast must the police car be moving to give this much change in the perceived frequency?
After the police car goes by you if you maintain your respective speeds and direction, what will be the frequency you here as he recedes from you?
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