Xiao Wang chose glass when decorating his house, and saw two effects: A is single-layer glass, and B is double-layer glass (interlayer is vacuumized). Xiao Wang wants to know them.

(1)(2) Sound transmission requires a medium, and there is a vacuum between two layers of glass, but the vacuum cannot transmit sound, so this kind of window can play a good sound insulation effect;

(3) Glass is transparent, and light can spread in transparent medium, so you can clearly see the outdoor scenery in a room with soundproof glass windows. The propagation speed of light in vacuum is 3× 108m/s, while the propagation speed of sound in air is 340m/s, which is 0.

So the answer is:

(1) double glass;

(2) Vacuum cannot transmit sound;

(3) The outdoor scenery can be seen clearly. The speed of light in vacuum is 3× 108m/s, while the speed of sound in air is 340m/s, which is zero in vacuum. Therefore, people can clearly see the outdoor scenery, but can't hear the outdoor sound.