Which harmonic mode of the pipe is resonantly excited by a 430 Hz source?

cbse
waves

#1

A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a 430 Hz source? Will the same source be in resonance with the pipe if both ends are open?


#2

As n is not integer hence open organ pipe cannot be in resonance with the source.