MCQ
A stretched string is vibrating in its $5^{th}$ harmonic as shown. Consider a particle $1(figure)$. At an instant this particle is at mean positions and is moving towards its negative extreme. Which of the following set of particles, are in same phase with particle $1$
- A$2, 4, 7$
- B$3, 5, 6$
- ✓$5, 7, 8$
- D$2, 4, 6$
