# An air column in a tube $32\; cm$ long, closed at one end, is in resonance with a tuning fork. The air column in another tube, open at both ends, of length 66 cm is in resonance with another tuning fork. When these two tuning fork.The air column in another tube, open at both ends, of length 66 cm is in resonance with another tuning fork. When these two tuning forks are sounded together, they produce $8$ beats per seconds. Then the frequencies of the two tuning forks are , (Consider fundamental frequencies only)
$(a)\;250\;Hz, 258\; Hz \quad (b)\;240\;Hz,248\;Hz \quad (c)\;264\;Hz,256\;Hz \quad (d)\;280\;Hz,272\;Hz$