Find the rationof the length of a closed pipe to that of an open pipe in order that the second overtone of the former is in unison with fourth overtone of the latter.

Explanation

To find the ratio of the length of a closed pipe to that of an open pipe such that the second overtone of the closed pipe is in unison with the fourth overtone of the open pipe, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Frequencies of Closed and Open Pipes**:
- The fundamental frequency of a closed pipe (N1) is given by:
\[
N_1 = \frac{V}{4L_1}
...