In the ocean depth submarines cannot communicate simply by radio transmission. Since radio as a form of electromagnetic wave effected radio silence for matter obstruction. Consequently radio silence is equivalently a form of light of silence. On the other hand, sound transmission is possible in all matter states: solids, liquids, and gases and maybe also in the plasma state which is mostly a state of dynamic electric charge equilibrium.

However, the vacuum state is a sound of silence where and when sound waves cannot be transmitted. Although light waves have no problem traveling for billions of lightyears. Sound requires the repeated collisions of matter particles while light requires the repeated collisions of vacuum particles also known as spacetime quanta. These are random vacuum spacetime charges collisions also known as quantum vacuum fluctuations which were demonstrated by Casimir experiments and where and when the squares of energy are always perfectly conserved resulting in a perfect symmetry of absolute consciousness. Incidentally the square root of square of energy give 1st power of energy and by the principle of special relativity is equivalent to mass. Therefore mass and energy are both square roots of spacetime charges. Since E can also be the product of 2 factors these are not necessarily equal. If these are the Hamiltonian energy and the Lagrangian energy functions then the product is given by (T+V)(T-V) or T-V, the difference of squares of kinetic energy and potential energy. Light of silence implies that T-V=0 or T=V. If V is the gravitational potential then T is the inertial potential derived from the inertial acceleration.