Kieff, Ptj, Wikipedia, public domain
B) Standing Wave – waves produced when two waves of the same frequency and amplitude travel in opposite directions in the same medium (Musical instruments)
Remember the old slinky song? - slinky.wav
Click on the frequencies above | Larger |
Standing waves can also be produced by reflection
How many nodes?
5
How many antinodes?
4
How many waves?
2
Wikipedia, Houtlijm, public domain
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Illustration of
vibrations
of a drum -
Oleg Alexandrov
AP Physics L = distance between walls String fixed at both ends L = (nl/2) n = 1,2,3 .... since v=fl then f_{n} = n[v/2L]
n = 1,2,3 .... Each frequency is a multiple of the fundamental frequency Pipe Open at One End
Closed at one end
L= [n/4]l n = 1,3,5,7 ..... since v=fl then f_{n} = nv/4L n = 1,3,5,7 ..... frequency goes up by 2 times fundamental and are divisible by ODD number Giancoli p. 348) 34, 36
34) Closed 88 Hz is fundamental 36) Open Pipe Fundamental 40 Hz, both are even number multiples of 40 not odd multiple of 20
f = v/2L = 40 Hz = (340 m/s)/2L L = 4.3 m
Review Book p. 302) 10.
Open at one end n = 1 fundamental f = v/4L = 340 m/s/(4 x .17) = 500 Hz
p. 303) 10
Beats - Rhythmic interference between two semi indentical frequency sources Enrichment
Enrichment
Standing Waves - Wake Forest .U.
Waves_in_a_Large_Free_Sphere_of_Water.mov
)
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