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Interference of sound
Seiche
A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.
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- HW1//: find the amplitude, period, and frequency for the following waveform. a. 20 sin 377t b. 5 sin 7541 c. 10° sin 10,000t e. -7.6 sin 43.6t d. 0.001 sin 942t f. ) sin 6.2831 HW/2 Find the phase relationship between the waveforms of cach set: a. v= 4 sin(wr + 50°) i = 6 sin(wr + 40°) b. v = 25 sin(ot - 80°) i = 5 x 10- sin(wr - 10°) c. v= 0.2 sin(wt - 60°) i = 0.1 sin(wr + 20°) d. v = 200 sin(wt i = 25 sin(wr 210°) 60°) HW/3 Repeat Problem 29 for the following sets: a. v = 2 cos(ot - 30°) i - 5 sin(wt + 60°) c. v= -4 cos(wt + 90°) i = -2 sin(wt + 10°) b. v = -1 sin(wt + 20°) i - 10 sin(wr - 70°)53. A closed pipe 3 ft long, compute the 6th harmonic if air temperature is 80°F. a.627.92 Hz b. 1240.42 Hz с. О d. 672.92 Hz a b C dSound An explosion occurs at a distance of 6.00 km from a person. How long after th explosion, does the person hear it? Assume the temperature is 14.0 °C. 17.671 s 16.771 s 11.671 s 17.071 s a. b. Compute the speed of sound in a monatomic ideal gas at 27.0 °C. Use M = 20.18 kg/kmol. a. C. 443.485 m/s 434.565 m/s 414.135 m/s b. d. 454.435 m/s A sound has an intensity of 3.00 x 108 W/m². What is the sound level in dB? a. C. 34.1712 dB 44.7712 dB 54.6132 dB 54.6321 dB b. d. A tuning fork oscillates at 284 Hz in air. Compute the wavelength of the tone emitted at 25 °C. 3.2912 m 1.1912 m An organ pipe whose length is held constant resonates at a frequency of 224.0 Hz when the air temperature is 15 °C. What will be its resonant frequency when the air temperature is 24 °C? 227.615 Hz 277.115 Hz a. b. a. b. C. d. 10.1361 μm 10.6431 μm C. d. a. 127.634 Hz 237.609 Hz b. An uncomfortably loud sound might have an intensity of 0.54 W/m². Find the maximum displacement of the molecules of air in a…
- 11. An open air column of length 1.40 m is in air at 24.2 °C. What is the frequency of the third harmonic?Air temperature in Kingsville can reach 400c. What is the speed of sound in air at this temperature? а. 343 m/s b. 354.4 m/s С. 340 m/s d. 350 m/sA brown bat uses echolocation to find mosquitos and eat on a hot 27.8°C summer night. 1. The bat sends out an ultrasonic pulse of sound and hears an echo from a mosquito after 2.37 × 10¬ª S. How far away is the mosquito? 2. Estimate the size of a mosquito. 3. In order to detect prey, bats must use a wavelength that is the same size, or smaller than the size of their prey. Estimate the minimum frequency a bat needs to use to detect mosquitos.
- 33. mmh At what temperature is the speed of sound in helium (ideal gas, y = 1.67, atomic mass = 4.003 u) the same as its speed in oxygen at 0 °C?. A tuning fork oscillates at 284 Hz in air. Compute the wavelength of the tone emitted at 25 °C. a. 3.2912 m b. 1.1912 m . An organ pipe whose length is held constant resonates at a frequency of 224.0 Hz when the air temperature is 15 °C. What will be its resonant frequency when the air temperature is 24 °C? 227.615 Hz 277.115 Hz a. b. C. d. a. 127.634 Hz b. 237.609 Hz . An uncomfortably loud sound might have an intensity of 0.54 W/m². Find the maximum displacement of the molecules of air in a sound wave if its frequency is 800 Hz. Take the density of air to be 1.29 kg/m³ and the speed of sound to be 340 m/s. 10.1361 μm 10.6431 μm C. d. 1.2192 m 2.1292 m C. d. 8.8271 μm 9.8721 μmD. inversely proportional to the square of the amplit 2. If the amplitude of sine wave is doubled, the intensity A. Remains the same. C. Increases by factor 4. D. Increases by factor 16 B. Increases by factor 2. 3. A mass suspended from the end of the spring vibrates up and down frequency and period of the vibration? A 1.5Hz, 0.67sec. 4. Á block of mass 1.6kg is attached to a horizontal spring that has forc compressed 2cm and is then released from rest. At what speed will position if a constant friction force of 1ON retards its motion from th A 70m/s. 5. Which one of the following statements is true a spring-mass system B. 0.67HZ, 1.5 sec. C. 0.0012HZ, 864sec. B. 50m/s. C. 70cm/s. uface? 11 time
- A sound wave, generated at a frequency of 440 hertz has a wavelength of 2.3 meters as ittravels through a solid material. The approximate speed of the wave is ____ m/sec.a. 140b. 190c. 760d. 1,000A wave is modeled by the wave function y(x, t) 2п 3.8 m What are the amplitude (A), wavelength (A), wave speed (v), period (P), frequency (f), and wave number (k) of the wave? a. A = 0.24 b. λ = C. U= d. P = e. f = f. k= Submit Question EE m/s S Hz m-1 Hint 1 = (0.24 m) sin -(x-(17.6 m/s) t)52. What is the frequency of the 11th overtone of a vibrating air column in an open pipe 50 cm long when the air temperature is 40°C. a. 4725.84 Hz b. 4275.84 Hz c. 4572.84 Hz d. 4257.84 Hz