In an open pipe when air column is \( 20 \mathrm{~cm} \) it is in resonance P with tuning fork \...

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In an open pipe when air column is \( 20 \mathrm{~cm} \) it is in resonance
P with tuning fork \( \mathrm{A} \). When length is increased by \( 2 \mathrm{~cm} \) then the

U. air column is in resonance with fork \( \mathrm{B} \). When \( \mathrm{A} \) and \( \mathrm{B} \) are sounded together 4 beats/sec are heard. Freqencies of \( A \) and \( \mathrm{B} \) are respectively (in \( \mathrm{Hz} \) )
a. 40,44
b. 88,80
c. 80,88
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