An open pipe's second harmonic is in resonance with turning fork of frequency f1. The pipe is then closed at one end and the frequency is slowly increased. It is found to be resonating in nth harmonic with frequency f2. Then which of following is correct? a)n=3 f2=3/4f1 b)n=5 f2=5/4f1 c)n=3 f2=5/4f1 d)n=5 f2=3/4f1.. I m getting c but ans is b.. Plz i need to know it..

Jitender Pal , 10 Years ago

Grade 9