An open organ pipe of length `l` is sounded together with another open organ pipe of length ` l + x` in their fundamental tones. Speed of sound in air is `v` . The beat frequency heard will be `(x lt lt l)`:

Options

A. `Vx^(2)//2L`
B. `VL//2x^(2)`
C. `Vx//2L^(2)`
D. `VL^(2)//2x`

Answer

C