Two people relaxing on a deck listen to a songbird sing. Oneperson, only 1.66 m from the bird, hears the sound with anintensity of 2.86 * 10-6 W>m2. (a) What intensity is heard bythe second person, who is 6.71 m from the bird? Assume thatno reflected sound is heard by either person. (b) What is thepower output of the bird’s song?
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.
Two people relaxing on a deck listen to a songbird sing. One
person, only 1.66 m from the bird, hears the sound with an
intensity of 2.86 * 10-6 W>m2
. (a) What intensity is heard by
the second person, who is 6.71 m from the bird? Assume that
no reflected sound is heard by either person. (b) What is the
power output of the bird’s song?
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for part b why do you not add both intensities to get the value for I, since it doesn't specify which intensity to use?
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