# Question about sound frequency of an organ ?

1. Jul 13, 2008

### physicsdawg

Question about sound frequency of an organ....?

1. The problem statement, all variables and given/known data

Based on this picture from the Jehmlich organ manufacturer in Dresden, Germany, estimate the frequency of sound produced by the organ pipe held by the man. Assume that the pipe is a tube open at both ends.
http://cache.daylife.com/imageserve/01iq4P0e330tQ/610x.jpg

2. Relevant equations

3. The attempt at a solution

I feel like the formula to be used is Fn=n(V/4L)...I am not sure how to estimate length (maybe 1.5 m based on the size of the person?) And ahve no idea what n would be, or if I am evenusing the right formula...any experts...?

2. Jul 13, 2008

### alphysicist

Re: Question about sound frequency of an organ....?

Hi physicsdawg,

No, I don't believe your equation is correct. That equation applies to the case of a tube with only one end open. Since the problem says assume that both ends are open, what formula do you get?

3. Jul 14, 2008

### physicsdawg

Re: Question about sound frequency of an organ....?

your right, it should be a 2L...from the picture I determine the length to be 1.5...what do you think of this estimation?

and how do I figure out what N equals??Thanx

4. Jul 14, 2008

### alphysicist

Re: Question about sound frequency of an organ....?

I believe your length estimate is okay; it seems to me like they just want you to find a rough estimate.

About N, I would think that they want you to find the fundamental frequency.

5. Jul 14, 2008

### physicsdawg

Re: Question about sound frequency of an organ....?

so just assume n=1? Then I get the final answer to be square root (344/3) = 114.6 m/s

does this look right??>

6. Jul 14, 2008

### alphysicist

Re: Question about sound frequency of an organ....?

The answer looks okay to me (are significant figures important?), but why did you say square root?