Question

A standing wave is formed by the superposition of two waves travelling in opposite directions. The transverse displacement is given by $y(x,t)=0.5\sin \left(\frac{5\pi }{4}x\right)\cos (200\pi t)$ What is the speed of the travelling wave moving in the positive $x$ direction?

• A. 160 m / s
• B. 90 m / s
• C. 180 m / s
• D. 120 m / s

Answer 1

Answer: (A)

$V=\frac{\omega }{K}$