You’ve been hired as a technical consultant to the police department to design a detector- proof device that measures the speed of vehicles. You know that a moving car emits a variety of characteristic sounds. You decide to make a very small device to be placed in the center of the road that will detect a specific frequency emitted by the car as it approaches and then measure the change in that frequency as the car moves off in the other direction. A microprocessor in the device will then compute the speed of the vehicle. To write the program for the microprocessor you need an equation for the speed of the car using the data received by the microprocessor. Your equation may also include necessary physical constants (such as the speed of sound).
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’ve been hired as a technical consultant to the police department to design a detector-
proof device that measures the speed of vehicles. You know that a moving car emits a
variety of characteristic sounds. You decide to make a very small device to be placed
in the center of the road that will detect a specific frequency emitted by the car as
it approaches and then measure the change in that frequency as the car moves off in
the other direction. A microprocessor in the device will then compute the speed of the
vehicle. To write the program for the microprocessor you need an equation for the speed
of the car using the data received by the microprocessor. Your equation may also include
necessary physical constants (such as the speed of sound).
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