Question 7 (1 points) What length should a bagpipe pipe have to produce a fundamental frequency of 238 Hz ? Assume the pipe is open at both ends and is being played at room temperature. Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 Enter answer here No answer submitted CHECK ANSWER 0 of 5 checks used Question 8 This question contains multiple parts. Make sure to read all the instructions and answer each part. Image size: s M L Max Auditory nerve Ear canal Eustachian tube Scroll to ? Questions Top BackEar drum Eustachian tube Part a (1 points) The ear canal can be though of as a tube leading from the outer ear to the ear drum that is closed at one end. The typical length of an adult human ear canal is 2.5 cm. What is the fundamental resonant frequency of the ear canal? Assume the air inside it is at body temperature (37. C). Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 Enter answer here HZ No answer submitted CHECK ANSWER 0 of 5 checks used Part b (1 points) Infants and small children have a substantially shorter ear canal. What effect would you expect this to have on their sensitivity to different frequencies? Select the correct answer CHECK ANSWER Saved 1 of 3 checks used Scroll to Top Quest BackPart b (1 points) Infants and small children have a substantially shorter ear canal. What effect would you expect this to have on their sensitivity to different frequencies? Select the correct answer Saved CHECK ANSWER 1 of 3 checks used The different length of ear canal should have no effect on frequency perception because the speed of sound is the same O regardless. They should be more sensitive to higher frequencies because of resonance in the ear canal The different length of ear canal should have no effect on frequency perception because only the resonant wavelength O Your Answer and not the frequency will change. O They should be more sensitive to lower frequencies because of resonance in the ear canal SHOW HINT Question 9 (1 points) Sound waves are directed into a tube that is filled with room-temperature air. The tube is open at one end and closed at the other. As the frequency of the sound waves is slowly raised, resonances are heard at 500 Hz and 700 Hz with none in between. What is the fundamental and next highest harmonic frequency? Scroll to T Ques Top BackQuestion 10 This question contains multiple parts. Make sure to read all the instructions and answer each part. In this question you will explore standing waves on a string using the same online simulation tool as in the previous homework set. Set up the parameters of the simulation as follows: 1) Set the mode (upper left corner) to Oscillate 2) Set the end conditions (upper right corner) to Fixed End. 3) Set the Damping slider to 0. 4) Set the Tension slider to high (as far as it will go) 5) Set the Amplitude slider to 0.03 cm 6) Hit Pause to stop the simulation for now. Also hit restart. 7) Turn on the Rulers (click the check-box in the bottom right) Recall that the velocity of the wave on this string under high tension is v = 6.2cm/s (we calculated this in the last homework). Image size: s M L Max Part a (1 points) Because we have set the amplitude of the oscillating wave to be so small (amplitude should be set to 0.03cm), we can approximate the left end as a node. Therefore we will treat this as a string that is fixed on both ends. Scroll to Questi Top BackPart a (1 points) Because we have set the amplitude of the oscillating wave to be so small (amplitude should be set to 0.03cm), we can approximate the left end as a node. Therefore we will treat this as a string that is fixed on both ends. Using the Rulers you can see on the screen, what do you expect to be the wavelength (in cm) of the fundamental mode on this string? (Don't run the oscillation yet) Select the correct answer No answer submitted CHECK ANSWER 0 of 3 checks used 15cm 5.0 cm 30 cm 7.5cm O 3.75cm Part b (1 points) Calculate the fundamental resonant frequency of this wave. (Recall that the wave velocity is 6.2cm/s). Test your answer by setting the frequency slider to whatever value you calculated, and playing the simulation. If you calculated correctly, then after some time you will see an n = 1 standing wave form with an amplitude much higher than the amplitude of the driving force, It might take a little while to really aet the wave going. Scroll toPart b (1 points) Calculate the fundamental resonant frequency of this wave. (Recall that the wave velocity is 6.2cm/s). Test your answer by setting the frequency slider to whatever value you calculated, and playing the simulation. If you calculated correctly, then after some time you will see an n = 1 standing wave form with an amplitude much higher than the amplitude of the driving force. It might take a little while to really get the wave going. Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 Enter answer here HZ No answer submitted CHECK ANSWER 0 of 5 checks used Part c (1 points) Calculate the frequency of the n = 2 harmonic, assuming the string is fixed on both ends. Repeat the simulation above with this new frequency and see if you can get a standing wave with two antinodes to form. Please enter a numerical answer below. Accepted formats are numbers or 'e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 Enter answer here Hz CHECK ANSWER No answer submitted 0 of 5 checks used Scroll to ? T Questions Top Back0 of 5 checks used Part d (1 points) Calculate what would be the next harmonic above the fundamental frequency if this string had one end free. Test your calculation by setting the boundary conditions to Loose End (upper right corner). Make sure to hit restart first. You should get a standing wave with amplitude much greater than the amplitude of the driving force. Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 Enter answer here HZ No answer submitted CHECK ANSWER 0 of 5 checks used Question 11 (1 points) (#196576) {Energy in Waves, Intensity) The low-frequency speaker of a stereo set has a surface area of A - 0.05 m- and produces 1 W of acoustical power. If the speaker projects sound uniformly in all directions, at what distance from the speaker is the intensity 0.1 W/m?? Select the correct answer CHECK ANSWER No answer submitted 0 of 3 checks used Scroll to Top Back