Pipe A , with length L , and pipe B , with length 2l , both have two open ends. Which harmonic of pipe B has the same frequency as the fundamental of pipe A ?

Explanation

To solve the problem of determining which harmonic of pipe B has the same frequency as the fundamental frequency of pipe A, we can follow these steps:

### Step 1: Understand the fundamental frequency of pipe A
For a pipe with both ends open, the fundamental frequency (first harmonic) is given by the formula:
\[ f_A = \frac{v}{2L} \]
where:
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