1) Some wind instruments (such as a flute) are open to the air at both ends. Other instruments (such as a clarinet) are closed at the end where the mouth blows and open at the other end. We'll call instrument A the open-open instrument and instrument B the open-closed instrument. a) Draw a picture which shows the lowest frequency standing wave that can be formed in instrument A. (No numbers or calculation, just a simple picture!) b) Draw a picture which shows the lowest frequency standing wave that can be formed in instrument B. (No numbers or calculation, just a simple picture!) c) An instrument designer wants to create the instruments so that when each is playing their lowest note possible, both instruments are playing the same exact frequency. To make this happen, describe how the length of A should compare to the length of B. A must be longer than B. A and B must be equal length. A must be shorter than B. i. ii. iii. Please clearly circle your answer above. You must explain your answer to get full credit! (Hint: Use your pictures from parts a) and b) to guide you!)

1) Some wind instruments (such as a flute) are open to the air at both ends. Other instruments (such as a clarinet) are closed at the end where the mouth blows and open at the other end. We'll call instrument A the open-open instrument and instrument B the open-closed instrument. a) Draw a picture which shows the lowest frequency standing wave that can be formed in instrument A. (No numbers or calculation, just a simple picture!) b) Draw a picture which shows the lowest frequency standing wave that can be formed in instrument B. (No numbers or calculation, just a simple picture!) c) An instrument designer wants to create the instruments so that when each is playing their lowest note possible, both instruments are playing the same exact frequency. To make this happen, describe how the length of A should compare to the length of B. A must be longer than B. A and B must be equal length. A must be shorter than B. i. ii. iii. Please clearly circle your answer above. You must explain your answer to get full credit! (Hint: Use your pictures from parts a) and b) to guide you!)

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter17: Physics Of Hearing

Section: Chapter Questions

Problem 50PE: The ear canal resonates like a tube closed at one end. (See Figure 17.39.) If ear canals range in...

See similar textbooks

Similar questions

Suppose all six equal-length strings of an acoustic guitar are played without fingering, that is, without being pressed down at any frets. What quantities are the same for all six strings? Choose all correct answers. (a) the fundamental frequency (b) the fundamental wavelength of the siring wave (c) the fundamental wavelength of the sound emitted (d) the speed of the string wave (e) the speed of the sound emitted
A crude approximation at voice production is to consider the breathing passages and mouth to be a resonating tube closed at one end. (See Figure 17.30.) (a) What is the fundamental frequency if the tube is 0.240-m long, by taking air temperature to be 37.0°C? (b) What would this frequency become it the person replaced the air with helium? Assume the same temperature dependence for helium as for air. Figure 17.30 The throat and mouth form an air column closed at one end that resonates in response to vibrations in the voice box. The spectrum of overtones and their intensities vary with mouth shaping and tongue position to form different sounds. The voice box can be replaced with a mechanical vibrator, and understandable speech is still possible. Variations in basic shapes make different voices recognizable.
A transverse wave on a siring is described by the wave function y=0.120sin(8x+4t) where x and y are in meters and t is in seconds. Determine (a) the transverse speed and (b) the transverse acceleration at t = 0.200 s for an element of the string located at x = 1.60 m. What are (c) the wavelength, (d) the period, and (e) the speed of propagation of this wave?
The ear canal resonates like a tube closed at one end. (See Figure 17.39.) If ear canals range in length from 1.80 to 2.60 cm in an average population, what is the range of fundamental resonant frequencies? Take air temperature to be 37.0°C, which is the same as body temperature. How does this result correlate with the intensity versus frequency graph (Figure 17.37 of the human ear? 17.39 The illustration shows the gross anatomy of the human ear. Figure 17.37 The shaded region represents frequencies and intensity levels found in normal conversational speech. The O-phon line represents the normal hearing threshold, while those at 40 and 60 represent thresholds for people with 40- and 60-phon hearing losses, respectively.
A steel wire with mass 25.0 g and length 1.35 m is strung on a bass so that the distance from the nut to the bridge is 1.10 m. (a) Compute the linear density of the string. (b) What velocity wave on the string will produce the desired fundamental frequency of the E1 string, 41.2 Hz? (c) Calculate the tension required to obtain the proper frequency. (d) Calculate the wavelength of the strings vibration. (e) What is the wave-length of the sound produced in air? (Assume the speed of sound in air is 343 m/s.)
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 30.0 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.0 1011 W/m2. What is the intensity delivered to the eardrum?
A family ice show is held at an enclosed arena. The skaters perform to music with level 80.0 dB. This level is too loud for your baby, who yells at 75.0 dB. (a) What total sound intensity engulfs you? (b) What is the combined sound level?
A sinusoidal wave in a string is described by the wave function y=0.150sin(0.800x50.0t) where x and y are in meters and t is in seconds. The mass per length of the string is 12.0 g/m. (a) Find the maximum transverse acceleration of an element of this string. (b) Determine the maximum transverse force on a 1.00-cm segment of the string. (c) State how the force found in part (b) compares with the tension in the string.
Write an expression that describes the pressure variation as a function of position and time for a sinusoidal sound wave in air. Assume the speed of sound is 343 m/s, = 0.100 m, and Pmax = 0.200 Pa.
A steel wire with mass 25.0 g and length 1.35 m is strung on a bass so that the distance from the nut to the bridge is 1.10 m. (a) Compute the linear density of the string. (b) What velocity wave on the string will produce the desired fundamental frequency of the E1 string, 41.2 Hz? (c) Calculate the tension required to obtain the proper frequency. (d) Calculate the wavelength of the strings vibration. (e) What is the wave-length of the sound produced in air? (Assume the speed of sound in air is 343 m/s.)
Write an expression that describes the pressure variation as a function of position and time for a sinusoidal sound wave in air. Assume the speed of sound is 343 m/s, = 0.100 m, and Pmax = 0.200 Pa.
With a sensitive sound-level meter, you measure the sound of a running spider as -10 dB. What does the negative sign imply? (a) The spider is moving away from you. (b) The frequency of the sound is too low to be audible to humans. (c) The intensity of the sound is too faint to be audible to humans. (d) You have made a mistake; negative signs do not fit with logarithms.