If I scream in a room with wooden walls or cement walls, which one will work better at preventing my sound from reaching outside the room?
Any structure of walls and ceilings will only provide minimal soundproofing unless you add a soundproof material to them like, styrofoam, cork, or fabric covered fiberglass. all of these materials are designed to absorb sound. Sound will bounce off a concrete wall more because of its density, but I would definitely use some sort of soundproofing if you need it to conceal noise. In recording studios I have used fabric covered sound insulation.
Cement. Wood will vibrate more than cement. Sound is made up of vibrations. I'll leave you to the conclusion.
Concrete or block will reflect the sound because of the hard surface, keeping it from transmitting. The wood will pick up and transmit the vibrations. That is why certain musical instruments are made of wood - they transmit and amplify the sound.
