question_answer 41)

                  During propagation of a plane progressive mechanical wave                 (a) all the particles are vibrating in the same phase.                 (b) amplitude of all the particles is equal.                 (c) particles of the medium executes S.H.M.                 (d) wave velocity depends upon the nature of the medium.

Answer:

                  (b, c, d) The options are self explanatory.