A siren starting from rest slides down a tall frictionless hill towards a biker. The biker travels at a constant velocity while the siren approaches him from behind. At the bottom of the hill, the siren will be traveling faster than the biker. How will the frequency of the siren change over time? It will start off lower than the original frequency of the siren, and increase in frequency until it is higher than the original. It will be exactly the same original frequency emitted by the siren, for the entire time the siren rolls down the hill. O It will be lower than the original frequency emitted by the siren, for the entire time the siren rolls down the hill. O It will be higher than the same original frequency emitted by the siren, for the entire time the siren rolls down the hill.
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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