Intensity level is 101 decibels at 4.91m. How far away would a person have to be for the sound to barely be audible (at the threshold of hearing).
How do I find this?
2006-12-13 13:14:26 · 3 answers · asked by Jeff H 1 in Science & Mathematics ➔ Physics
A rock groiup is playing in a bar. Sound emerging from the door spreads uniformly in all directions. The intensity level of the music is 101 dB at a distance of 4.91m from the door. At what distance is the music just barely audible to a person with a normal threshold of hearing? Disregard absorption. Answer in units of m.
2006-12-13 13:22:57 · update #1
Threshold of hearing-
Intensity level (dB) = 0
Intensity (W/m^2) = 10^-12
2006-12-13 13:29:09 · update #2
Find out how many decibels the threshold of hearing is. Intesity falls off at 1/(r^2) where are is the distance from the source. You know what the ratio of intensity to distance is so just plug it in to. (101/ (4.91)^2) = (Threshold of hearing) / (x^2) where x is the distance you are looking for.
2006-12-13 13:20:18 · answer #1 · answered by Anonymous · 1⤊ 0⤋
haha, don't be silly. It depends on the frequency of the sound. Is it a High C or a Low E? you need to know the frequency, this makes a huge difference in the answer.
2006-12-13 13:18:43 · answer #2 · answered by jpferrierjr 4 · 0⤊ 0⤋
Are we in a controlled enviornment?
2006-12-13 13:16:25 · answer #3 · answered by Dave S 3 · 0⤊ 0⤋