First slide

Stationary waves

Question

The equation $y = 0 .15 \sin 5 x \cos 300 t$ , describes a stationary wave. The wavelength of the stationary wave is

Easy

A

Zero
B

1.256 metres
C

2.512 metres
D

0.628 metre

Solution

On comparing the given equation with standard equation $\frac{2 π}{λ} = 5 \Rightarrow λ = \frac{6 .28}{5} = 1 .256 m$

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