Which of the following is NOT an effect produced during a transformation initiated by demotion?

The correct choice identifies sound as not being an effect typically produced during a transformation initiated by demotion. In the context of physical transformations, demotion often refers to a process in which particles are brought closer together, usually leading to a conversion of energy forms, primarily into light, pressure, and heat.

Light is generated through various mechanisms during energy transformations, such as during a chemical reaction that emits photons. Pressure is also a significant effect when particles are compressed, as in the cases of gas being forced into a smaller volume, which increases the pressure in that system. Intense heat, or thermal energy, is commonly released as kinetic energy is converted to thermal energy when particles move closer together.

Sound, however, is not typically a direct result of these transformations. While sound can occur in certain cases where the demotion process creates rapid changes in pressure or creates vibrations in a medium, it is not an inherent effect of demotion itself and doesn't consistently arise from this process in a predictable manner. Thus, identifying sound as not being a typical outcome highlights its lesser relevance in comparison to the other effects listed.