A standing wave in a pipe with a length `L = 1.2 m` is described by
`y(x,t) = y_(0)sin[(2pi//L)x]sin[(2pi//L)x+pi//4]`
Based on above information, which one of the following statements is incorrect. (Speed of sound in air is `300 ms^(-1)`)–

Options

A. The pipe is closed at both ends
B. The wavelength of the wave could be 1.2 m
C. There could be a node at x = 0 and antinode at `x = L//2`
D. The frequency of the fundamental mode of vibrations is 137.5 Hz

Answer

D