First slide

Standing waves

Question

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

Moderate

A

$\frac{20}{n}$
B

$\frac{10}{n}$
C

$\frac{5}{n}$
D

$\frac{n}{10}$

Solution

Distance between the consecutive node = $\frac{λ}{2}$
but $λ = \frac{v}{n} = \frac{20}{n} so \frac{λ}{2} = \frac{10}{n}$

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