The TL of 10 mm thick sheet of plywood at 1000 Hz is 34 dB. Based on the mass law, what is the expected TL: at 63 Hz? at 31 Hz for a 20 mm thick sheet?
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 TL of 10 mm thick sheet of plywood at 1000 Hz is 34 dB. Based on the mass law, what is the expected TL:
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at 63 Hz?
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at 31 Hz for a 20 mm thick sheet?
2. Two adjacent rehearsal rooms are separated by a 4" thick brick wall (TL250 Hz= 33 dB). The common wall is 10 m high and 10 m long. The total absorption in the receiving room is 200 metric sabins. A guitar playing in one room produces a measured sound pressure level at 250 Hz of 80 dB in that source room.
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What is the NR at 250 Hz?
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What would the level be in the receiving room?
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