1.

A whistle whose air column is open at both ends has a fundamental frequency of 5100 Hz. If the speed of sound in air is 340 ms^(-1), the length of the whistle, in cm, is

Answer»

`5//3`
`10//3`
5
`20//3`

SOLUTION :Let L be the LENGTH of the whistle.
FUNDAMENTAL frequency, `v=v/(2L)`
where v is the speed of sound in air.
or `L =v/(2v)`
SUBSTITUTING the given values , we get
`L = 340/(2 xx 5100) = 1/30 m = 10/3 m`


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