Question

1. For a particular tube, there are four of six harmonic
frequencies below 1000 Hz are 300 Hz, 600 Hz,
750 Hz and 900 Hz. Find the frequencies missing
from list
(1) 100, 200 Hz (2) 150, 400 Hz
(3) 150, 450 Hz (4) 450, 800 Hz​

Answer 1

• Frequencies missing from the list is 150 and 450.

Given frequencies are 1000 Hz, 300 Hz, 600 Hz, 750 Hz, and 900 Hz.

As we can see that this is a closed organ pipe with v/2L = 150 where v is the velocity and L is the length of the pipe.

fc = nv/2L where fc is frequency of closed organ pipe, n is the fundamental frequency.

Hence all the frequencies are 150, 300, 450, 600, 750 and 900.

So the missing frequencies are 150, 450.

Regards

Answer 2

Answer:150,450

Explanation: