A loudspeaker emits sound waves isotropically (uniformly in all directions). The average acoustic power delivered by the loudspeaker is P = 5.00 W . There are two 1. S_av listeners, one is at a distance R¸ =12.0 m , and the other is at a distance R, = 24.0 m. a. What is the intensity of the sound (in W / m² ) at the listener A's position, I ?
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Given that
The average acoustic power delivered by the loudspeaker is
and distance
Therefore cross sectional area for distance is given by
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- A loudspeaker emits sound waves isotropically (uniformly in all directions). The average acoustic power delivered by the loudspeaker is P a = 5.00 W . There are two 1. S_av listeners, one is at a distance R =12.0 m, and the other is at a distance R, = 24.0 m. a. What is the intensity of the sound (in W / m² ) at the listener A's position, I, ? b. What is the sound level in dB heard by listener A, B, ? What is the sound level in dB heard by listener B, B, ? С.30 m from an ultrasonic sensor. The total travel time of the ultrasonic wave is 33 ms (milliseconds). What is the speed of sound in these conditions?You're using an ultrasonic sensor in the deep depths of the ocean to identify shipwrecks. However, you first need to calibrate your sensor for these conditions, as the speed of sound is unknown in the cold, high pressure conditions you are working in. You set up an experiment in a lab where you recreate the environmental conditions of the deep ocean and place an object 30 m from an ultrasonic sensor. The total travel time of the ultrasonic wave is 33 ms (milliseconds). What is the speed of sound in these conditions?
- I'm not sure how to solve this type of problem. Detailed steps would be very helpful, please. The intensity of a sound wave is 100 W/m2 at a distance of 3 m. a. What is the intensity of the sound wave at a distance of 6 m? b. What is the intensity at 9 m?The total power consumption by all humans on earth is approximately 1013 W. Let’s compare this to the power of incoming solar radiation. The intensity of radiation from the sun at the top of the atmosphere is 1380 W/m2. The earth’s radius is 6.37 × 106 m.a. What is the total solar power received by the earth?b. By what factor does this exceed the total human power consumption?A student hears a sound with a power of P = 42 μW. At their distance from the source, the sound has intensity I = 0.71 W/m2. A. Assuming the eardrum is circular, what is the radius of their eardrum, in meters? B. Another student stands in the exact same location, but receives 20% more power from the same source. What is the radius of the second student's eardrums?
- An interface is formed between a block of aluminium (with an acoustic impedance of 1.8 x 107 kg m2 s') and a block of copper (with an acoustic impedance of 4.6 x 107 kg m-2 s-1). Longitudinal sound waves travelling through the aluminium are normally incident on the boundary, and are partially reflected. a) What is the ratio of the amplitude of the reflected wave to that of the incident wave? Number b) What is the ratio of the amplitude of the transmitted wave to that of the incident wave? Number c) What percentage of the incident power is transmitted? Number d) What percentage of the incident power is reflected? Number % Ouit P Sove QuestiThe figure below shows wave fronts of sound waves from the siren of a police car. Two people on both side of the car are running at 5 m/s to the left. The frequency of the siren is 400 Hz. The person on the left observes a frequency of 388.7 Hz. Speed of sound in air is 340 m/s. a) How fast is the policy car travelling? b) What is the frequency observed by the person on the right? c) What is the wavelength observed by the person on the righ? R