Two waves are approaching each other with a velocity of 20 m/s and frequency n. The distance between two consecutive nodes is

(1) $\frac{20}{n}$

(2) $\frac{10}{n}$

(3) $\frac{5}{n}$

(4) $\frac{n}{10}$

(2) Distance between the consecutive node $=\frac{\lambda }{2},$

but $\lambda =\frac{v}{n}=\frac{20}{n}$ so $\frac{\lambda }{2}=\frac{10}{n}$

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