ak74 don't penetrate walls.this happens if only the wall is weak,wearing out,old or not a real wall.walls are usually hard and thick.the bullet is capable of boring holes in the wall not making it porous just like the ak47.
Yes, microwave waves can penetrate through brick walls.
no
Yes, radiation has the ability to penetrate through walls depending on the type and energy level of the radiation.
Yes, probably.
Photographs can't... infrared is a possibility.
Allows it to penetrate more walls, and does a little more damage
infrared
Yes, anthough this will greatly decrease the range of the signal.
It means the person is alone and that he does not let anyone get close to him.
Dog whistles are not effective in communicating with dogs through walls because the sound waves produced by the whistle are not able to penetrate solid barriers like walls.
A friend and I often fire a 3/8 inch steel plate he has set up in his back yard. Most of the time, using Wolf ammunition (manufactured at the Tula Cartridge Works), it won't penetrate through. However, Norinco and other brands of military ammo - which aren't hollow pointed and subject to the increased expansion of being hollow pointed - often are able to penetrate it.
The AK47 was invented by Mr.Kalishnakov, In the Soviet Union.