An audio engineer takes decibel readings at distances of r1 = 11 m and r2 = 21 m from a concert stage speaker during a soundcheck. When he is r1 from the speaker, the engineer registers a decibel level of β1 = 114 dB on his loudness meter. Part A: What is the intensity of the sound, I1, in watts per square meter, that is measured by the loudness meter when the engineer is a distance of r1 from the speaker? Part B: How much power P, in watts, is coming from the speaker during the soundcheck at distance r1? Part C: Assuming that the speaker output does not change between the two measurements at r1 and r2, what sound intensity level β2, in decibels, will the loudness meter report when the engineer is at a distance r2 from the speaker?
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.
An audio engineer takes decibel readings at distances of r1 = 11 m and r2 = 21 m from a concert stage speaker during a soundcheck. When he is r1 from the speaker, the engineer registers a decibel level of β1 = 114 dB on his loudness meter.
Part A: What is the intensity of the sound, I1, in watts per square meter, that is measured by the loudness meter when the engineer is a distance of r1 from the speaker?
Part B: How much power P, in watts, is coming from the speaker during the soundcheck at distance r1?
Part C: Assuming that the speaker output does not change between the two measurements at r1 and r2, what sound intensity level β2, in decibels, will the loudness meter report when the engineer is at a distance r2 from the speaker?
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