Each octaves is double the frequency of the previous octave.
If initial frequency is $f$.
Final frequency $=2 \times 2 \times 2 f$ or $2^3 f$ or $8 f$
$\therefore$ Frequency ratio $=8: 1$.
$(A)$ The speed of sound determined from this experiment is $332 m s ^{-1}$
$(B)$ The end correction in this experiment is $0.9 cm$
$(C)$ The wavelength of the sound wave is $66.4 cm$
$(D)$ The resonance at $50.7 cm$ corresponds to the fundamental harmonic

