50cm
70cm
100cm
150cm
200cm
Correct answer is A
\(\lambda\) = \(\frac{v}{f}\) = \(\frac{340}{170}\) = 2m ; for closed pipe L = \(\frac{1}{4}\)\(\lambda\) = \(\frac{1}{4}\) x \(\frac{2}{1}\) = 0.5m = 50cm
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