1.00 m* B 2.00 m -4.00 P
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Two small loudspeakers, A and B (Fig. ), are driven by the same amplifier
and emit pure sinusoidal waves in phase. (a) For what frequencies
does constructive interference occur at point P? (b) For what frequencies
does destructive interference occur? The speed of sound is 350 m/s.
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- Two identical loudspeakers are placed on a wall 3.00 m apart. A listener stands 5.00 m from the wall directly in front of one of the speakers. A single oscillator is driving the speakers at a frequency of 300 Hz. (a) What is the phase difference in radians between the waves from the speakers when they reach the observer? (Your answer should be between 0 and 27.) rad (b) What is the frequency closest to 300 Hz to which the oscillator may be adjusted such that the observer hears minimal sound? HzTwo identical speakers are initially equal distancesfrom a listener . Thelistener hears a sound maximum (constructiveinterference). When the upper speaker is moved backby a distance d = 2 m, the listener hears a soundminimum (destructive interference). What is thelongest wavelength the soundwaves could have?At an outdoor music event, a dB meter records 130 dB when placed 2.25 m in front of aloudspeaker near the stage. A) What was the power output of the speaker, assuminguniform spherical spreading of the sound and neglecting any absorption, reflection andinterference of the sound that may occur? B) How far away would you need to be forthe sound level to be 80 dB?
- Satellite TV is broadcast from satellites that orbit 37,000 km above the earth’s surface. Their antennasbroadcast a 15 kW microwave signal that covers most of North America, an area of about 2.5 × 107km2(a) What is the total power that strikes a 46-cm-diameter ground-based dish antenna? [3](b) The dish antenna focuses the incoming wave to a 1.0 cm2 area. What is the amplitude of theelectric field at this focus? [2](a) If the speaker is at its lowest frequency (f= 2,000 Hz) that produces destructive interference at the location of the microphone, what is the path length difference AL (in m) between the direct and the reflected sound waves that reach the microphone? toTwo identical loudspeakers are placed on a wall 3.00 m apart. A listener stands 5.00 m from the wall directly in front of one of the speakers. A single oscillator is driving the speakers at a frequency of 300 Hz. (a) What is the phase difference in radians between the waves from the speakers when they reach the observer? (Your answer should be between 0 and 2.7.) rad (b) What is the frequency closest to 300 Hz to which the oscillator may be adjusted such that the observer hears minimal sound? Hz
- A point source in air (speed of sound = 343 m/s) is located 0.5 m above a solid, perfectly reflecting floor and emits sound at 257 Hz. Find the MAXIMUM directivity of the sound source in this location.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 .