Questions about Sound in pipes

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Presentation transcript:

Questions about Sound in pipes

Equations and facts needed to solve the subsequent problems vw = 331 +0.6t v = λf Length of pipe between any two harmonics = ½ λ For an Open pipe: fundamental λ = 2L Subsequent harmonics at 2f1, 3f1, 4f1… For Closed pipe: Fundamental λ = 4L Subsequent harmonics at 3f1, 5f1,7f1…

Q1 A 440 Hz tuning fork is held above a closed pipe. Find the spacing between resonances when air temp is 20°C in centimeters and meters

Q2 440 Hz tuning fork is used with a resonating column to determine the velocity of sound in Helium gas. If the spacing between resonances are 110 cm, what is the velocity of sound in helium gas?

Q3 The frequency of a tuning fork is unknown. A student uses an air column at 27°C and find resonances spaced by 20.2 cm. What is the frequency of the tuning fork?

Q4 A bugle can be thought of as an open pipe. If a bugle were straightened out, it would be 2.65 m long. A) If the speed of the sound was 343 m/s, find the lowest frequency that is resonant for the bugle. B) Find the next 2 resonant frequencies for the bugle.

Q5 The auditory canal leading to the eardrum is a closed pipe that is 3.0 cm long. Find the approximate value of the lowest resonance frequency.

Q6 If you hold a 1.2 m aluminum rod in the center and hit one end with a hammer, it will oscillate like a open pipe. The speed of sound in aluminum is 5150 m/s. What would be the bar’s lowest frequency of oscillation?

Q7 A flute acts as an open pipe. If a flute sounds a note with a 370 Hz pitch, what are the frequencies of the 2nd, 3rd, and fourth harmonics of this pitch

Q8 A clarinet sounds the same note with a 370 Hz pitch as the flute in the previous problem. The clarinet, however, is a closed pipe. What are the frequencies of the 2nd, 3rd, and 4th harmonics produced by this instrument?

Q9 A guitar string is 65.0 cm long and is tuned to produce a lowest frequency of 196 Hz. A) Is the guitar treated as a open or closed end resonator? B) what is the speed of the wave on the string?

Q10 The lowest note produced from a pipe organ is 16.4 Hz. A) What is the shortest open pipe that will resonate at this frequency? B) What is the pitch if the same organ pipe is closed?