What would be good to put in and out of ear defenders and why?
A heavy material would be desirable for sound deadening because its mass would absorb more of the sound energy. For example, in cars the product Dynamat is used, but its heaviness is a problem even for cars. However, the problem with a heavy material is that the weight on a person’s head could be irritating, so there is a trade off of sound deadening versus weight. Not any heavy material would work. Metals have tightly packed atoms, so they conduct sound waves quite efficiently – there are no “loose” atoms that can be left vibrating afterward which would reduce the amount of sound energy that gets all the way through the material. The design of a good ear defender (or ear muff) might also include the principle of the anechoic chamber, as explained in the link below. Basically, the sound waves are bounced back and forth within the pockets in the wall, until they die out. When you stand in an anechoic chamber, the walls absorb all sounds, so much so that when you close your eyes, the exp
