If Two Adjacent Frequencies of an Organ Pipe Closed at One

Multiple Choice

If two adjacent frequencies of an organ pipe closed at one end are 500 Hz and 700 Hz,what is the length of the organ pipe? (v_sound = 340 m/s)

A) 0.85 m
B) 1.25 m
C) 1.50 m
D) 1.70 m