question archive In a stretch string fixed at both ends, the seventh harmonic occurs at 90 Hz
In a stretch string fixed at both ends, the seventh harmonic occurs at 90 Hz
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In a stretch string fixed at both ends, the seventh harmonic occurs at 90 Hz. Assuming the speed of
transverse wave in the string is 30 m s , find the length of the string.
The length of a pipe with one end closed is 20.0 cm. If the speed of sound in air is 330 ms
find the three lowest frequencies for the sound emitted when one blows across the open end of the pipe.
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- length of string =1.167 m
- 1st frequency =4500 Hz
2nd frequency =1125 Hz
3rd frequency =642.85 Hz
- f=nV/2L here f is frequency , n is harmonic number , V is wave speed , L length of string
90 =7*30 /2*L
L =1.167 m
2.first lowest frequency = V/(L/3)
=330/(0.2/3)
=4500 Hz
Second lowest frequency = V/(4L/3)
=330/(4*0.2/3)
=1125 Hz
first lowest frequency = V/(7*L/3)
=330/(7*0.2/3)
=642.85Hz
