(a) A sound wave traveling in 20°C air has a pressure amplitude of 0.832 Pa. What is the intensity of the wave? (Assume the density of air is 1.29 kg/m3. Enter your answer in W/m2.) in W/m2 (b) A sound wave traveling in 20°C air has a pressure amplitude of 0.853 Pa. What intensity level does the sound correspond to? (Assume the density of air is 1.29 kg/m3. Enter your answer in dB.) in dB (c) If a large housefly 2.5 m away from you makes a noise of 34.0 dB, what is the noise level (in dB) of 7100 flies at that distance, assuming interference has a negligible effect? in dB (d) The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound level goes up by 80.0 dB?
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) A sound wave traveling in 20°C air has a pressure amplitude of 0.832 Pa. What is the intensity of the wave? (Assume the density of air is 1.29 kg/m3. Enter your answer in W/m2.)
(b) A sound wave traveling in 20°C air has a pressure amplitude of 0.853 Pa. What intensity level does the sound correspond to? (Assume the density of air is 1.29 kg/m3. Enter your answer in dB.)
in dB
(c) If a large housefly 2.5 m away from you makes a noise of 34.0 dB, what is the noise level (in dB) of 7100 flies at that distance, assuming interference has a negligible effect?
in dB
(d) The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound level goes up by 80.0 dB?
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