A string is non-stretchable, i.e., compression and rarefactions cannot be produced in strings. Therefore, longitudinal waves in strings are not possible strings do have elasticity of shape. Therefore, waves on strings are transverse.
A string is non-stretchable, i.e., compression and rarefactions cannot be produced in strings. Therefore, longitudinal waves in strings are not possible strings do have elasticity of shape. Therefore, waves on strings are transverse.