The speaker system at an open-air rock concert forms a ring around the entire circular stage and delivers 60,000 W of power output. Assume the sound radiates in all directions equally as if it were generated by an isotropic point source and assume the sound energy is not absorbed by air. (a) At what distance is the sound from the speakers barely audible? Note that your answer will be far too large since the model we are using for sound level ignores the power absorbed by the medium (air). m How does your answer compare to the radius of the Earth? dspeakers rEarth = (b) What is the closest distance audience members can be to the speakers if the sound is not to be painful to their ears? m
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.
The speaker system at an open-air rock concert forms a ring around the entire circular stage and delivers 60,000 W of power output. Assume the sound
m
How does your answer compare to the radius of the Earth?
| dspeakers |
| rEarth |
(b) What is the closest distance audience members can be to the speakers if the sound is not to be painful to their ears?
m
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