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(C) When two waves of the same frequency and velocity travel in opposite directions, they form a standing wave.For a wave, the relationship between ve

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$9/n$

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(C) When two waves of the same frequency and velocity travel in opposite directions, they form a standing wave.For a wave, the relationship between velocity $(v)$, frequency $(n)$, and wavelength $(\lambda)$ is given by $v = n \lambda$.Given $v = 18	ext{ m/s}$, we have $18 = n \lambda$, which implies $\lambda = 18/n$.In a standing wave, the distance between two consecutive antinodes is equal to half the wavelength $(\lambda/2)$.Therefore, the distance between two consecutive antinodes $= \lambda/2 = (18/n) / 2 = 9/n	ext{ m}$.

Two waves of same frequency $(n)$ approaching each other with same velocity of $18\text{ m/s}$ interfere. The distance between two consecutive antinodes is

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