How far must one stand from a 3.8 mW point sound source if the intensity at that location is at the hearing threshold? Assume the sound waves travel to the listener without being disturbed.
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How far must one stand from a 3.8 mW point sound source if the intensity at that location is at the hearing threshold? Assume the sound waves travel to the listener without being disturbed.
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- The sound level 23.8 m from a loudspeaker is 66.7 dB. What is the rate at which sound energy is produced by the loudspeaker, assuming it to be an isotropic source?The scream of a little screaming monster reaches the near-side of a sound-insulating wall with an intensity of 95 dB. The manufacturer of the wall claims the material in the wall will reduce the sound energy by 99%. If this is true, what intensity, in decibels, of sound will be heard on the other side of the wall?A sound wave radiates from a speaker in all directions. If the power of the sound source is 200 W, calculate the intensity level in dB of the sound wave 1 km from the speaker. Hint: Presume that the sound waves spread as a sphere (not a hemisphere).
- By measurement you determine that sound waves are spreading out equally in all directions from a point source and that the intensity is 2.9x10-2 W/m² at a distance of 4.0 m from the source.according to the barometric measurements, the sound has a decibel level of 180 dB at a distance of 161 km. Assuming the intensity falls off as the inverse of the distance squared, what was the decibel level on the island 4800 km away?The sound level at a distance of 3.0 m from a source is 120 dB. a) At what distance will the soundlevel be 100 dB? b) At what distance will the sound level be 10 dB?
- A round speaker emits sound waves uniformly in all direction. At a distance of 40.0m from the speaker, the sound intensity is 35 dB. What is the sound intensity level in a distance of 10.0m.Sounds from the street below come through an open window measuring 0.75 m by 0.88 m.If the power of the sound is 1.2 x 10 W, what is its intensity?Suppose that a public-address system emits a 494 Hz sound uniformly in all directions. (a) If the air temperature is 250C (sound travels at 346 m/s), what is the wavelength of this sound? (b) If the intensity at a location 22 m away from the sound source is 3x10-4 W/m2, what is the power of the sound coming from the speaker?
- A sound wave radiates from a speaker in all directions. If the power of the sound source is 250 W, calculate the intensity level in dB of the sound wave 0.4 km from the speaker. Hint: Presume that the sound waves spread as a sphere (not a hemisphere).A 60 year old person has a threshold of hearing at f=10 kHz of 79.0 dB. In contrast, a typical young adult's threshold at 10 kHz is only =43.0 dB. If the young adult can just barely hear a 10 kHz tone, by what factor must the intensity of the sound wave be amplified so that it is heard by the older person?A listener is standing on a ground that is non-absorbing. Situated at a distance from the listener are two sound sources such that: source A has a sound power of 5 W and 15 m from the listener and source B has a power of 15 W and 25 m from the listener. What is the sound pressure level the listener would hear