SSC MTS EXAM

Detailed explanation-1: -Solids are made up of particles (atoms) that do not move about because they are closely packed (touching each other) and held together by strong intermolecular forces. Therefore, they are always in a fixed position and can only vibrate in a fixed position, sending sound waves along its path very fast.

Detailed explanation-2: -The particles in a solid are held in a fixed position by bonds. This can be a lattice or it can be a more random arrangement of particles. Either way, they are fixed. The particles vibrate about their fixed position but they are always attached to the same neighbours.

Detailed explanation-3: -The particles in a solid vibrate because the vibration of surrounding particles causes fluctions in the force fields which maintain the structure of the solid.