Imagine you are in an open field where two loudspeakers are set up and connected to the same amplifier so that they emit sound waves in phase at 688 HzHz. Take the speed of sound in air to be 344 m/sm/s. What is the shortest distance d you need to walk forward to be at a point where you cannot hear the speakers? The forward direction is defined as being perpendicular to a line joining the two speakers and you start walking from the line that joins the two speakers.

Party hearing. As the number of people at a party increases, you must raise your voice for a listener to hear you against the background noise of the other partygoers. However, once you reach the level of yelling, the only way you can be heard is if you move closer to your listener, into the listener's "personal space." Model the situation by replacing you with an isotropic point source of fixed power Pand replacing your listener with a point that absorbs part of your sound waves. These points are initially separated by r = 1.10 m. If the background noise increases by Aß = 4.50 dB, the sound level at your listener must also increase. What separation rț is then required? Number i Units

For testing purposes, a musical instrument manufacturing company creates a device so that when you blow into one end with your instrument, sound comes out the other end in opposite directions. A sound technician uses a whistle and generates sound waves with a frequency of 200 Hz. The waves travel in opposite directions in a sound studio, are reflected by end walls, and return. The studio is 50.0 m long and the whistle is located 14.0 m from one end. What is the phase difference (in degrees) between the reflected waves when they meet at the source of the sound? The speed of sound in air is 343 m/s.

A 1,720-Hz tone is played on a stereo in an open field. A person stands at a point that is 4 m from one of the speakers and 4.4 m from the other. What must the minimum wavelength be for the person to hear the tone? (Hint: because of interference, two waves add constructively or destructively. If the sound is heard the interference must be constructive. For interference to be constructive, the difference in distance must be a multiple of the wavelength. That is, the difference in distances from the speakers must be 1 wavelength, two wavelengths, three wavelengths, etc.)

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.]

answer fast I will give upvotes \What acoustic frequency is required of a plane acoustic wave in an acousto-optic cell so that a beam from a He-Ne laser is deflected by ? Consider the case of (a) flint glass for which the sound velocity is 3km/s and n=1.95 and (b) sapphire crystal with the sound velocity of 11km/s and n=1.76.

Suppose a Speaker is at (0, a.4)m. An Identical opeaker, Connected to the same amplifier is at l6.4,0) M. Both Speakers are putting out a scrund with the same frequency and phase. Find the x-value of a point of construcHve interference between (0,0) and the Speaker on the x-axis, regardless of frequency .

A 1,720-Hz tone is played on a stereo in an open field. A person stands at a point that is 4 m from one of the speakers and 4.4 m from the other. What must the minimum wavelength be for the person to hear the tone? (Hint: because of interference, two waves add constructively or destructively. If the sound is heard the interference must be constructive. For interference to be constructive, the difference in distance must be a multiple of the wavelength. That is, the difference in distances from the speakers must be 1 wavelength, two wavelengths, three wavelengths, etc.)