Why Do Low Frequencies Travel Through Walls. Sound does not travel through walls. Low frequency do travel further than high frequency on earth because the high frequency wave lengths are more easily absorbed by the molecules in higher frequency sounds are immediately absorbed by the walls, that's why they pass around corners better than through the walls.
Also, i'm not sure if it's that the waves spread out in air, or just that they don't propagate as far in air.
What happens in the transmission of sound from one room to another, is this: More easily set them into forced vibrations. Radio waves have frequencies as high as 300 gigahertz (ghz). As a form of uwb radar, stepped frequency continuous wave (sfcw) radars have been preferred due to their advantages.