A tone's duration is reduced from 100 msec to 50 msec. What change in threshold is anticipated following energy detector model? Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer. a b C a 3 dB change No change 1 dB change 2 dB change
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- WT-2 A pipe closed at one end and open at the other has a length of 0.750m. Jiatai places a speaker producing a low sound frequency above the open end of the tube. He then increases the frequency slowly. The pipe is in air at sea level. a) Draw the possible standing wave patterns for the sound waves in the tube starting with the lowest frequency. lowest frequency fa fo fa highest open end L=0.750m closed end L=D L= 2 b) Below each pattern write the tube-length-to-wavelength relationship for each pattern. c) Write the general symbolic relationship for the frequency of the n" harmonic, fn. Specify the possible values for n. d) Put the known information into your equation and find the numerical value of the frequencies fa, f, fes and fg. e) Jiatai can hear frequencies up to 19,980HZ. What is the highest frequency of the highest harmonic that Jiatai can hear from this tube and what is the harmonic number n of that harmonic?WT-2 A pipe closed at one end and open at the other has a length of 0.750m. Jiatai places a speaker producing a low sound frequency above the open end of the tube. He then increases the frequency slowly. The pipe is in air at sea level. a) Draw the possible standing wave patterns for the sound waves in the tube starting with the lowest frequency. lowest frequency fa fo fa highest open end L=0.750m closed end L%3D L= L= b) Below each pattern write the tube-length-to-wavelength relationship for each pattern. c) Write the general symbolic relationship for the frequency of the n" harmonic, fn. Specify the possible values for n. d) Put the known information into your equation and find the numerical value of the frequencies fa, f, fe, and få. e) Jiatai can hear frequencies up to 19,980HZ. What is the highest frequency of the highest harmonic that Jiatai can hear from this tube and what is the harmonic number n of that harmonic? Answers WT-1 a) L=/4, L=32J4, L=52/4, L=7/4 b) 0.166m WT-2 a)---…A whale emits a frequency of 420 Hz in the ocean. An observer in a submarine moving toward the whale at 15 m/s detects a frequency of 427.33 Hz when the whale is approaching the submarine at 12 m/s. Calculate the speed of sound in the water.
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