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.
During maneuvers in the northern Pacific Ocean, two attack submarines are heading straight for each other on a collision course. The first sub is traveling at 30 km/hr, while the second submarine is traveling at 75 km/hr. The first sub sends out a sonar pulse of 1000 Hz which is picked up by the second sub.
What is the frequency of the sonar pulse detected by the second sub? The speed of sound in seawater is 1520 m/s.
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