The effect of making a hole exactly at `(1//3^(rd))` of the length of the pipe from its closed end is such that :

Options

A. its fundamental frequency is an octave higher thanthe open pipe of same length
B. its fundamental frequency is thrice of that before making a hole
C. the fundamental frequency is `3//2` time of that before making a hole
D. the fundamental alone is changed while the harmonics expressed as ratio of fundamentals remain the same

Answer

B, D