Sound waves at ultrasonic frequencies attenuate much faster than audible sound waves. The sound intensity level of a point source of ultrasonic sound waves is measured as 100 dB at a distance of 1.00 m from the source and 65 dB at 2.00 m. Assuming the waves spread in all directions, what is the attenuation coefficient alpha? [Answer in 1/m to within 5%]
Sound waves at ultrasonic frequencies attenuate much faster than audible sound waves. The sound intensity level...
Sound waves at ultrasonic frequencies attenuate much faster than audible sound waves. The sound intensity level of a point source of ultrasonic sound waves is measured as 100 dB at a distance of 1.00 m from the source and 65 dB at 2.00 m. Assuming the waves spread in all directions, what is the attenuation coefficient alpha? [Answer in 1/m to within 5%]
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 24.2 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.50 ✕ 10−11 W/m2. What is the intensity delivered to the eardrum?
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 30.7 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 2.70 x 101 W/m2. What is the intensity delivered to the eardrum? W/m2
A 85.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 85.0-Hz sound wave?
5. A sound source has an intensity I1 and when its sound level is measured at a fixed distance the found value is 70 dB. The source increases its intensity to I2 and when its sound level is measured at the same distance the found value is 96 dB. What is the I2 / I1 ratio?
A sound source in all directions with the same intensity. If at point A, which is 3.00 m from the source, the sound intensity level is 80.0 dB. At what distance from the source is point B, if the intensity level of the sound in it is 60.0 dB? determine the distance from the source to point B
Two small loudspeakers emit sound waves of different frequencies equally in all directions. Speaker A has an output of 1.30 mW, and speaker B has an output of 2.00 mW. Two speakers A and B are represented as points which serve as the centers of concentric circles representing sound waves emanating from the speakers. The concentric circles about speaker A are spaced more closely together than the concentric circles about speaker B. The points lie along a horizontal line, and...
2) (8 points) Show your work for full credit. An omnidirectional loudspeaker produces sound waves uniformly in all directions. A sound intensity of 100 W/mºis measured 1.0 m from the speaker. (a) How far from the speaker will the sound intensity be measured to be 1.0 W/mº? (b) At what distance from the speaker will the sound intensity level be 100.0 dB?
3. A trumpet creates a sound intensity level of 1.15*102 dB at a distance of 1.00 m. I. What is the sound intensity of a trumpet at this distance? II. What is the sound intensity of five trumpets at this distance? III. Find the sound intensity of five trumpets at the location of the first row of an audience, 8.00 m away, assuming, for simplicity, the sound energy propagates uniformly in all directions. IV. Calculate the decibel level of the...
5. By how many decibels do you reduce the sound intensity level due to a source of sound if you double your distance from it? Assume that the waves expand spherically. dB 6. The sound in a classroom is 63000 times as intense as the minimum threshold of hearing. What is the intensity level of this sound in decibels? dB