Suppose that the sound level of a conversation is initially at an angry 74 dB and then drops to a soothing 54 dB. Assuming that the frequency of the sound is 516 Hz, determine the (a) initial and (b) final sound intensities and the (c) initial and (d) final sound wave amplitudes. Assume the speed of sound is 344 m/s and the air density is 1.21 kg/m3. (a) Number Units (Ь) Number Units (c) Number Units
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.
Given data:
The initial sound level is,
I1 =74 dB
The final sound level is,
I2= 54 dB
The frequency of the sound is,
f= 516 Hz
The density of air is,
= 1.21 kg/m3
The velocity of sound in air is,
v =344 m/s
Formula used:
Sound level is given as,
The intensity of the sound is given as,
Where,
- Density of air
f- frequency of sound
v- Velocity of sound in air
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