The sound of normal breathing is not very loud, with an intensity of about 11 dB at a distance of 1 m away from the face of the breather. Note that in this problem sound intensity in decibels is denoted 3; intensity in W/m² is denoted I. Part A Given that a person with normal hearing can barely detect a sound with intensity of 1 dB at a frequency of 1 kHz (the sensitivity of the human ear peaking near 1 kHz), how far away could this person detect another person breathing normally? Express the distance Ddetect in meters. ► View Available Hint(s) Ddetect= Submit Part B do = LIVE ΑΣΦ ΠΠ ΑΣΦ Η 3 Submit Provide Feedback 3 In general, if a sound has intensity of 8 dB at 1 m from the source, at what distance do from the source would the decibel level decrease to 0 dB? Since the limit of hearing is 0 dB this would mean you could no longer hear it. Express the distance in terms of ß. Be careful about your signs! ► View Available Hint(s) Ċ E ? ? . m m Next >
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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