After years of being alone and never getting a single phone call, Daniel understandably forgets to shut off his cell phone in class. One miraculous day, he finally receives a call and accidentally allows the ringer to emit sound waves uniformly in all directions. At a distance of 13.0 m. from the source, Mr. O'Hara's sensitive ears observe the intensity level to be 94.0 dB. What is the total acoustic power output of the cell phone speaker, in watts?
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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