Final answer:
Option C, two layers of 0.5 centimeter thick glass with 0.3 centimeters of vacuum between them, would make the best soundproofing wall for a room.
Step-by-step explanation:
The wall that would make the best soundproofing for a room is option C, which consists of two layers of 0.5 centimeter thick glass with 0.3 centimeters of vacuum between them.
Soundproofing is determined by the ability of a material to absorb and reflect sound waves. The layers of glass with a vacuum between them act as a barrier that reflects the sound waves, preventing them from passing through the wall. The vacuum serves to further reduce the transmission of sound, as it is a poor conductor of sound waves.
Compared to option A, a thicker single layer of glass, and option B, two layers of glass with air between them, option C is more effective at soundproofing because the vacuum creates a greater barrier to the passage of sound waves.