Question

The angle between wave velocity and particle velocity in a travelling wave may be

• A. zero
• B. $\frac{\pi }{2}$
• C. $\pi$
• D. All of these

Answer 1

The correct option is D All of these

Each particle in a wave oscillates about its mean position perpendicular to the direction of wave propagation. The speed of the wave is however linked with the frequency and wavelength of the particles by $v=\frac{\omega }{k}$