Sound exerts a pressure P on the human ear.† This pressure increases as the loudness of the sound increases. If the loudness D is measured in decibels and the pressure P in dynes† per square centimeter, then the relationship is given by the following formula. P = 0.0002 × 1.122D (a) If an ordinary conversation has a loudness of about 52 decibels, what is the pressure exerted on the human ear by this conversation? (Round your answer to two decimal places.) dyne/cm2 (b) A high decibel level causes pain to the ear and can result in damage. What is the pressure level on the ear exerted by a decibel level of 120? (Round your answer to two decimal places.) dyne/cm2
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.
Sound exerts a pressure P on the human ear.† This pressure increases as the loudness of the sound increases. If the loudness D is measured in decibels and the pressure P in dynes† per square centimeter, then the relationship is given by the following formula.
(a) If an ordinary conversation has a loudness of about 52 decibels, what is the pressure exerted on the human ear by this conversation? (Round your answer to two decimal places.)
dyne/cm2
(b) A high decibel level causes pain to the ear and can result in damage. What is the pressure level on the ear exerted by a decibel level of 120? (Round your answer to two decimal places.)
dyne/cm2
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