You are walking around a large open field. The only objects nearby are two identical speakers set some distance apart. The speakers emit sound in phase with a wavelength of 4 m. As you wander around the field, you notice that at certain locations the sound you hear is surprisingly loud, whereas at others it seems unusually quiet. You conclude that you are observing the effects of interference between the two sources of sound waves. For each of the locations given, indicate what sort of interference would occur at that point.
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- Two loudspeakers are mounted on a rack, one h = 2.74 m above the other. Exactly 8.00 meters to the right of the midpoint, a microphone rests at point O. Point O is equally distant from each loudspeaker. The loudspeakers are driven by the same tone generator and vibrate in phase at 390 Hz. It is possible to create a condition of destructive interference at Point O by changing one or both of the path lengths (r1 and r2) between speaker and microphone. Suppose that this is done by raising the upper speaker while leaving the lower speaker in place. What is the smallest vertical distance (in m) that you would need to raise the upper speaker by, in order to create destructive interference at Point O? (The speed of sound waves in air is 343 m/s.)1. The figure shows a loudspeaker A and point C, where a listener is positioned. IACI = 2.50 m and the angle 0 = 50 °. A second loudspeaker B is located somewhere to the left of A. The speakers vibrate out of phase and are playing a 61.0 Hz tone. The speed of sound is 343 m/s. What is the third closest distance to speaker A that speaker B can be located, so that the listener hears no sound? mConsider the speaker set-up in the previous question. Each speaker emits a frequency of 6.6·102 Hz in phase with the other. The listener is seated directly in front of one speaker, 1.6 m away. The speakers are 2.4 m away from each other. How many extra wavelengths are needed for sound to get from speaker 2 to the listener? Take the speed of sound in air to be 3.4·102 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.)A thin film of oil (n=1.4) rests on the surface of a pool of water (n=1.33). Light with frequency 5.0x10^14 Hz traveling through air (n=1) is normally incident upon the oil, undergoing thin film interference. a) Will there be a relative phase shift? b) What is the wavelength of the light in the oil? c) What minimum thickness should the oil have if we wish to get constructive interference? d) What minimum thickness should the oil have if we wish to get destructive interference? Please write your answers in the space below and email your work. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). B I U S Paragraph Arial V 10pt くく AV I XQ 5 ते EE ...Question 8
- The figure shows a loudspeaker A and point C, where a listener is positioned. [AC| = 4.00 m and the angle 8 = 44 °. Asecond loudspeaker B is located somewhere to the left of A. The speakers vibrate out of phase and are playing a 61.0 Hztone. The speed of sound is 343 m/s. What is the third closest to speaker A that speaker B can be located, so that thelistener hears maximum sound?You are walking around a large open field. The only objects nearby are two identical speakers set some distance apart. The speakers emit sound in phase with a wavelength of 4 m. As you wander around the field, you notice that at certain locations the sound you hear is surprisingly loud, whereas at others it seems unusually quiet. You conclude that you are observing the effects of interference between the two sources of sound waves. For each of the locations given, indicate what sort of interference would occur at that point. Constructive interference Destructive interference In betweenA 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.)