Answer:
0.95277 m
one end closed and the other end open
Explanation:
The harmonics are
630, 810, 990
So,
[tex]7\times 90=630,\ 9\times 90=810,\ 11\times 90=990[/tex]
This can be only done when the pipe has one end open and the other end closed.
The fundamental frequency is 90 Hz
Fundamental frequency is given by
[tex]f=\dfrac{v}{4L}\\\Rightarrow L=\dfrac{v}{4f}\\\Rightarrow L=\dfrac{343}{4\times 90}\\\Rightarrow L=0.95278\ m[/tex]
The length of the pipe is 0.95277 m
The pipe has one end closed and the other end open
