Wave Motion 2 Question 25

25. A tube, closed at one end and containing air, produces, when excited, the fundamental note of frequency $512 Hz$. If the tube is opened at both ends the fundamental frequency that can be excited is (in $Hz$ )

(1986, 2M)

(a) 1024

(b) 512

(c) 256

(d) 128

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Answer:

Correct Answer: 25. (a)

Solution:

  1. $f _c=\frac{v}{4 l}=512 Hz$

$$ f _o=\frac{v}{2 l}=2 f _c=1024 Hz $$



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