19 cars in a circle at a boom box competition produce a 130 dB sound intensity level at the center of the circle. What is the average sound intensity level (in dB) produced there by each stereo, assuming interference effects can be neglected?

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Ten cars in a circle at a boom box competition produce a 120-dB sound intensity level at the center of the circle. What is the average sound intensity level produced there by each stereo, assuming interference effects can be neglected?

What are the three longest wavelengths for standing sound waves in a 127-cm-long tube that is (a) open at both ends and (b) open at one end, closed at the other?

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Two loud speakers are 3m apart. A person is listening to a single pitch at 680Hz. Theperson is along the back wall, which is reasonably far, what are two directions from the center ofthe speakers where the person would expect to have the music loud? Repeat for two directionsthat are quiet.The person is now standing at the location that is 4m directly in front of one of thespeakers. Determine whether that position is loud, quiet or somewhere between the twoextremes. Explain. Use a diagram to help. [Note: Do not assume the person is far away.Comment on why that makes a difference.]

Example M 500 High Rings for some time before dying out. A tuning fork with Q = 1000 is struck, producing a sound at 1 m of 60 dB with a frequency of 440 Hz. How loud is the sound after 10 seconds...? Q=1/4 A(t) = Age-t 入

The sound pressure level at 250 Hz is 50 dB in one room and in 30 dB in the other. The surface area of the wall between them is 15 m2. The total amount of absorption at 250 Hz in the room with the lower noise level is 20 Sabines. What is the sound reduction index of the separating partition at 250 Hz:a. 20.0 dBb. 17.5 dBc. 18.8 dBd. 44.8 dB

A harvest mouse can detect sounds as quiet as -10 dBdB. Suppose you are sitting in a field on a very quiet day while a harvest mouse sits nearby. A very gentle breeze causes a leaf 1.1 mm from your head to rustle, generating a faint sound right at the limit of your ability to hear it. The sound of the rustling leaf is also right at the threshold of hearing of the harvest mouse.  How far is the harvest mouse from the leaf?