• How long is this pipe? • If one end is now closed, find the wavelength of the new fundamental. • If one end is now closed, find the frequency of the new fundamental.
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- •19 Go Figure 17-35 shows two isotropic point sources of sound, S, Figure 17-35 Problems 19 and 105. and S2. The sources emit waves in phase at wavelength 0.50 m; they are separated by D = 1.75 m. If we move a sound detector along a large circle centered at the midpoint between the sources, at how many points do waves arrive at the detector (a) exactly in phase and (b) ex- actly out of phase?• Part A A harvest mouse can detect sounds as quiet as -10 dB. 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 1.7 m 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? Express your answer with the appropriate units. µA 国? d = Value m Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining < Return to Assignment Provide Feedbacka) In the first harmonic (choose one to answer): the wavelength is the smallest, the frequency is the largest, the speed is the smallest, the voltage is the largest b) The first overtone (choose one to answer): has half the wavelength of the fundamental pattern, has twice the wavelength of the fundamental pattern, has half the frequency of the fundamental pattern, has twice the speed of the fundamental pattern c) The wave length of the fifth harmonic is (choose one to answer): 1/5 of the length of the second harmonic, 5/2 of the wave length of the second harmonic, 2/5 of the wave length of the second harmonic, 5 times the length of the second harmonic, the same as the wave length of the fifth overtone
- 16.37 • Two small stereo speakers Figure E16.37 are driven in step by the same variable- frequency oscillator. Their sound is picked up by a microphone arranged as shown in Fig. E16.37. For what fre- quencies does their sound at the speak- ers produce (a) constructive interference and (b) destructive interference? 4.50 m- 2.00 m Microphone•30 The source of a sound wave has a power of 1.00 µW. If it is a point source, (a) what is the intensity 3.00 m away and (b) what is the sound level in decibels at that distance?Problem 3 Design a FDMA system that carries three message signals: (i) A sinusoidal message of frequency fm1 = 200 Hz, amplitude: 2, (ii) A sinusoidal message of frequency fm2 = 400 Hz, amplitude: 3, and (iii) A sinusoidal message of frequency fm3 = 500 Hz, amplitude: 2. %3D Use carrier signals of frequencies: fc1 = 2000 Hz, fc2 = 5000 Hz and fc3 = 8000 Hz respectively %3D Use AM modulation. (i) (ii) Plot the Composite FDMA signal showing all three AM modulated signals Plot the signal in (i) in frequency domain. Identify the peaks. What do they mean? Now using band pass filters and low pass filters, recover the three messages at the receiver. (i) (ii) Plot the recovered messages in (a) time domain, (b) frequency domain Were you able to recover the original message signal?