Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ravi bhushan Best Answer
The three characteristics of the medium necessary for sound propagation in a medium are: The medium is required to be elastic so that its particles may revert to their initial position after displacement on either side. In other words, the particles are capable of vibrating about their mean positions. The medium must have inertia in order for the particles to store mechanical energy. The medium should be frictionless such that them is no loss of energy in propagation of sound through it. Therefore Option A is the correct answer.