1.

Air is blown at the mouth of a tube of length 25 cm and diameter equal to 2 cm open at both ends. If velocity of sound in air is `330 ms^(-1)`, the sound emitted will have all the frequencies in the groupA. 330, 990, 1690 HzB. 302, 664, 1320 HzC. 660, 1320, 1980 HzD. 660, 100, 3300 Hz

Answer» Correct Answer - c
Fundamental frequency , `n=v/(2l)=330/(2xx0.25)=660`
Frequency of overtones are
`2n, 3n, 4n, ...=1320, 1980, 2640` Hz


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