A "C" flute creates the note C4 when it is played at its resonance frequency, that is 261 Hz on the evenly tempered scale. Flute frequencies are changed by opening holes in its tube, creating a node at that hole and effectively shortening the 66 cm tube. The flute and the guitar make a good instrumental combination, and for that they must be tuned together. You have seen that a guitar's 6 strings are usually tuned to (E) 329.63 Hz E4 (B) 246.94 Hz B3 (G) 196.00 Hz G3 (D) 146.83 Hz D3 (A) 110.00 Hz A2 (E) 82.41 Hz E2 1. Is there a way to alter the frequency of the flute so that it matches one of these open strings at resonance? Explain your answer. 2. Given the length of its tube and the frequency of the flute sound, what is the speed of sound in air it has been made for? 3. At what temperature would the air be in °C to give this speed? What is that in °F? 4. At this temperature, what is the most probable speed of a nitrogen molecule in m/s?
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.
A "C" flute creates the note C4 when it is played at its resonance frequency, that is 261 Hz on the evenly tempered scale. Flute frequencies are changed by opening holes in its tube, creating a node at that hole and effectively shortening the 66 cm tube. The flute and the guitar make a good instrumental combination, and for that they must be tuned together. You have seen that a guitar's 6 strings are usually tuned to
- (E) 329.63 Hz E4
- (B) 246.94 Hz B3
- (G) 196.00 Hz G3
- (D) 146.83 Hz D3
- (A) 110.00 Hz A2
- (E) 82.41 Hz E2
1. Is there a way to alter the frequency of the flute so that it matches one of these open strings at resonance? Explain your answer.
2. Given the length of its tube and the frequency of the flute sound, what is the speed of sound in air it has been made for?
3. At what temperature would the air be in °C to give this speed? What is that in °F?
4. At this temperature, what is the most probable speed of a nitrogen molecule in m/s?
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