Find the greatest length of an organ pipe open at both ends that will have its fundamental frequency in the normal hearing range (20-20,000 Hz). Speed of sound in air `= 340 ms^-1`.

Explanation

To find the greatest length of an organ pipe open at both ends that will have its fundamental frequency in the normal hearing range (20-20,000 Hz), we can follow these steps:

### Step 1: Understand the relationship between length and wavelength
For an organ pipe open at both ends, the fundamental frequency (first harmonic) has a wavelength (λ) that is twice the length (L) of the pipe. This can be expressed as:
\[ L = \frac{\lambda}{2} \]
Thus, we can rearrange this to find the wavelength:
\[ \lambda = 2L \]

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