Find the noise level at a distance of 500 meters from the same source?ī) The average noise level at a distance of 50 meters from a source is 70 dB. The noise level in the 1st hour is 30 dB, in the 2nd hour is 50 dB, in the 3rd hour is 35 dB, in the 4th hour is 40 dB, in the 5th hour is 45 dB, in the 6th hour is 50 dB, in the 7th hour is 40 dB, and in the 8th hour is 30 dB.ī) The average noise level at a distance of 50 meters from a source is 70 dB. Intensity and the deciBel System A source of sound produces sound energy that propagates outward from the source in roughly all directions. Yes, if the reference level used for decibel scale is above threshold of hearing. According to the chart, a 60 dB sound has an intensity that’s one thousand times that of the 30 dB sound (1,000,000 pW/m 2 compared to 1,000 pW/m 2). Answer the following:Ī) Find the equivalent noise level that a person is exposed to in an 8-hour shift. Sound level is not the same thing as sound intensity. By compressing the high end of the scale and expanding the low end of the scale, the. Since the range of amplitudes our ears can hear is very large, a logarithmic scale is used.
The decibel scale relates the amplitude of sound waves to their loudness. Find the total noise level in dB at a location in a factory, which is exposed to noise from 4 sources, which have been individually timed. This skill sheet provides practice problems in using the decibel scale.