Drew is trying to build a new room that he and his band can practice in. His mom reminds him that he should use materials that will absorb and slow down the movement of the sound waves as much sound as possible so that they can’t hear him in the rest of the house. The pictures show four of the materials that Drew has to build the walls in his new “band room.”

Which of the materials above should Drew use on the walls so that they will SLOW down the sound waves the most?

Explain your choice from number 1? Why did you choose this material to SLOW down the mechanical (sound) waves?