A periodic vibration at x = 0, t = 0 displaces air molecules along the x direction by smax = 4.6E-05 m. The motion produces a sound wave that travels at a velocity of v = 332 m/s with a frequency of f = 95 Hz. Take the density of air as ρa = 1.20 kg/m3. f. The sound wave is directly incident on a sheet of paper of surface area A = 0.043 m2. Calculate the maximum force Fmax, in newtons, exerted on this sheet. g. If the frequency of the sound wave were increased by a factor of 100, how would the force exerted on the sheet in part (f) change?
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.
A periodic vibration at x = 0, t = 0 displaces air molecules along the x direction by smax = 4.6E-05 m. The motion produces a sound wave that travels at a velocity of v = 332 m/s with a frequency of f = 95 Hz. Take the density of air as ρa = 1.20 kg/m3.
f. The sound wave is directly incident on a sheet of paper of surface area A = 0.043 m2. Calculate the maximum force Fmax, in newtons, exerted on this sheet.
g. If the frequency of the sound wave were increased by a factor of 100, how would the force exerted on the sheet in part (f) change?
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