4. The howler monkey is the loudest land animal and can be heard up to a distance of 9.8 km at an intensity of 10-12 W/m?. Assume the acoustic output of a howler to be uniform in all directions (point source). Find the distance at whic the intensity level of a howler's call is 25 dB, in SI 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.
Show Basic Equations First, before plugging in numbers. Include units in all answers. If there is more than one part, separate the work for Part (a) and the other parts clearly by labels. Draw accurate free-body as appropriate for each problem, with vectors drawn in correct directions and labeled. Box all answers.
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