The average intensity of a wave on a given surface is defined as the rate at which energy flows through the surface. (you may use the scientific notation with "e" when submitting answers with powers of 10. Eg: 1.38 10-15 = 1.38e-15) (b) Calculate the intensity level of a sound if its intensity is half of the "threshold of pain" intensity dB (c) Machines used to cut metals create loud sounds. If such a machine creates a sound intensity of 4.00 x 10-5 W/m2, what is the intensity level of the sound generated by the machine in decibels? dB (d) If there are 50 identical such machines operating at the same time inside a factory, calculate the intensity of sound inside the factory (assume that the noise inside the factory is only due to these metal cutting machines)? W/m2
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 average intensity of a wave on a given surface is defined as the rate at which energy flows through the surface. (you may use the scientific notation with "e" when submitting answers with powers of 10. Eg: 1.38 10-15 = 1.38e-15)
(b) Calculate the intensity level of a sound if its intensity is half of the "threshold of pain" intensity dB
(c) Machines used to cut metals create loud sounds. If such a machine creates a sound intensity of 4.00 x 10-5 W/m2, what is the intensity level of the sound generated by the machine in decibels?
dB
(d) If there are 50 identical such machines operating at the same time inside a factory, calculate the intensity of sound inside the factory (assume that the noise inside the factory is only due to these metal cutting machines)?
W/m2
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