Resonance and tubes

  • Thread starter m.l.
  • Start date
  • #1
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Homework Statement


An open vertical tube is filled with water and a tuning fork vibrates over its mouth. As the water level is lowered in th etube, resonance is heard when the water level has dropped 17 cm, and again after 49 cm of distance exists from the water to the top of the tube. What is the frequency of the tuning fork?


Homework Equations


lamda=2xlength, f=v/ lamda, speed of sound is 343m/s


The Attempt at a Solution


49-17=35

lamda=2l (or is it lamda=4l cause its a closed system?)
=2x.35
=0.70m

f=v/lamda
=343m/s/0.70m
= 4.9x10 exponent 2 Hz?
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
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1. Homework Statement
An open vertical tube is filled with water and a tuning fork vibrates over its mouth. As the water level is lowered in th etube, resonance is heard when the water level has dropped 17 cm, and again after 49 cm of distance exists from the water to the top of the tube. What is the frequency of the tuning fork?

lamda=2xlength, f=v/ lamda, speed of sound is 343m/s

3. The Attempt at a Solution
49-17=35
Isn't 49 - 17 = 32 ?
 

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