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(D) When two waves of the same frequency and velocity travel in opposite directions along the same path,they form a stationary wave.Given frequency is

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$\frac{6}{n}$

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(D) When two waves of the same frequency and velocity travel in opposite directions along the same path,they form a stationary wave.Given frequency is $n$ and velocity $v = 12 \ m/s$.The wavelength $\lambda$ is given by the relation $v = n\lambda$,so $\lambda = \frac{v}{n} = \frac{12}{n}$.In a stationary wave,the distance between two consecutive nodes is equal to half the wavelength,i.e.,$d = \frac{\lambda}{2}$.Substituting the value of $\lambda$,we get $d = \frac{1}{2} 	imes \frac{12}{n} = \frac{6}{n}$.

Two waves of same frequency $(n)$ are approaching each other with same velocity of $12 \ m/s$ along the same linear path and interfere. The distance between two consecutive nodes is

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