In a closed end pipe of length \( 105 \mathrm{~cm} \), standing waves are set up corresponding t...

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In a closed end pipe of length \( 105 \mathrm{~cm} \), standing waves are set up corresponding to the third overtone. What distance from the closed end, amongst the following is a pressure node?
\( \mathrm{P} \)
(a) \( 20 \mathrm{~cm} \)
(b) \( 60 \mathrm{~cm} \)
(c) \( 85 \mathrm{~cm} \)
(d) \( 45 \mathrm{~cm} \)
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