Choose the correct statement regarding wave motion. [NCERT Exemplar]

Choose the correct statement regarding wave motion. [NCERT Exemplar]
  1. (a) Mechanical transverse waves can propagate through all mediums
  2. (b) Longitudinal waves can propagate through solids only
  3. (c) Mechanical transverse waves can propagate through solids only
  4. (d) Longitudinal waves can propagate through vacuum

Solution

Transverse mechanical waves displace elements of the medium perpendicular to the direction of propagation, producing a change in shape (shear deformation). Solids and strings have a nonzero shear modulus and can sustain shear stress, so transverse waves propagate in them. Fluids (liquids and gases) cannot sustain shear stress in static equilibrium and therefore do not support mechanical transverse waves. Hence the explanation given is correct.

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