Compare the length of a closed organ pipe and an open organ pipe, if the second overtone of the open pipe is unison with the second overtone of the closed organ pipe.

Explanation

To solve the problem of comparing the lengths of a closed organ pipe and an open organ pipe when their second overtones are in unison, we can follow these steps:

### Step 1: Understand the frequency formulas for both pipes
- For an open organ pipe, the frequency of the nth overtone is given by:
\[ f_n = \frac{n v}{2L'} \]
where \( L' \) is the length of the open pipe, \( v \) is the speed of sound, and \( n \) is the overtone number.
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