Two pipes are each \( 50 \mathrm{~cm} \) in length. One of them is closed at one end while the o...

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Two pipes are each \( 50 \mathrm{~cm} \) in length. One of them is closed at one end while the other is open at both ends. The speed of sound in air is \( 340 \mathrm{~m} \mathrm{~s}^{-1} \). The frequency at which both the pipes can resonate is
(a) \( 680 \mathrm{~Hz} \)
(b) \( 510 \mathrm{~Hz} \)
(c) \( 85 \mathrm{~Hz} \)
(d) none of these
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