# Frequencies problem

1. Nov 28, 2004

### araw83

The lowest tone to resonate in a close-end pipe of length L is 200Hz. Which is of the following frequencies will not resonate in the pipe?

400Hz
600Hz
1000Hz
1400Hz

Anyone know where I should start on this?

2. Nov 28, 2004

### Hurkyl

Staff Emeritus

3. Nov 28, 2004

### Pyrrhus

This is simple, just remember for one end closed.

Fundamental Frequency:

$$f_{1} = \frac{v}{4l}$$

The rest of the frequencies will be given by

$$f_{n} = (2n-1)f_{1} ... n=1,2,3...$$