Question

The angle between wave velocity and particle velocity in a travelling wave (Longitudinal or Transverse wave ) may be (in radians)

• A. $0$
• B. $\frac{\pi }{4}$
• C. $\frac{\pi }{2}$
• D. $\pi$

Answer 1

Answer: (A), (C), (D)

The correct options are
A $0$
C $\frac{\pi }{2}$
D $\pi$

For longitudinal travelling wave, angle between wave velocity and particle velocity is either zero or $\pi$.
For transverse travelling wave, angle between wave velocity and particle velocity is $\frac{\pi }{2}$.
Thus, option (a), (c), (d) are correct.