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dgoudie
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Homework Statement
A tuning fork is set into vibration above a vertical open tube filled with water, as seen in the figure below.
http://capaserv.physics.mun.ca/giancoli-calc/Graphics/Graph16/dgian1686.gif
The water level is allowed to drop slowly. As it does so, the air in the tube above the water level is heard to resonate with the tuning fork when the distance from the tube opening to the water level is L1 = 0.115 m and L2 = 0.400 m. What is the frequency of the tuning fork? Assume that the speed of sound in air is 343 m/s.
Homework Equations
F=V/wavelength
at first I assumed it was a closed tube and used:
Fn=nv/(4L)
The Attempt at a Solution
I treated it like a closed tube, and tried F= V/4L
but the computer said it was wrong.
I fiddled around a couple of times and tried it as an open tube and still couldn't get the right answer.
Ive tried: 746 Hz, 301 Hz, 1200 Hz, and 1490 Hz.
Can anyone see what I am doing wrong?
Thanks iun advance
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