For a person with defective hearing ability, hearing aid is often required. Assume a hearing aid uniformly increases the intensity level of all audible frequencies of sound by 50 dB. The hearing aid picks up a sound at an intensity of 5.0 x 10-7 W/m2 at 250 Hz. The threshold of pain in sound intensity level for a normal person at this frequency is about 122 dB. Will the threshold of pain be reached if a person with normal hearing ability wears this hearing aid just for fun? Show how you reach your conclusion.
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.
For a person with defective hearing ability, hearing aid is often required. Assume a
hearing aid uniformly increases the intensity level of all audible frequencies of sound
by 50 dB. The hearing aid picks up a sound at an intensity of 5.0 x 10-7 W/m2 at
250 Hz. The threshold of pain in sound intensity level for a normal person at this
frequency is about 122 dB. Will the threshold of pain be reached if a person with
normal hearing ability wears this hearing aid just for fun? Show how you reach your
conclusion.
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