The general formula for the number of decibels corresponding to a change in sound intensity to I₂ relative to the former intensity I, is 3₂-B₁=AB=10 log10 (2) dB. Figure d₂ d₁ 1 of 1 Part B Find the change in intensity level AB of a point source of sound that results from moving the listener initially at a distance d₁ to a distance d₂ from the source (Figure 1). Express the change in intensity level in terms of d₁ and d₂, using log(x) for the logarithm of a base 10. View Available Hint(s) AB= 20log (2) dB Submit Previous Answers ✔Correct Note th The figure shows two men at the distances of d 1 logarithm of a number less than 1 is negative. and d 2 from the sound system. Part C If d₂ is 3.16 times as far away from the source as d₁, by how many decibels will the sound at d₂ be changed relative to that at d₂ ? Give your answer numerically in decibels. AB= -ΓΙΑΣΦ Submit Request Answer [y] ? 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.
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