Digital vs. Analog Signals Activity for Kids

How It Works

Our electronic devices send and receive information through pulses of radio waves. Radio waves can go through most things, even walls, but there are some things they can’t go through. Since you can hear your phone ring when it is wrapped in the piece of paper, that means that radio waves went through the piece of paper and reached your phone. You’ll notice that when your phone is wrapped in the aluminum foil, it’s not ringing when called. This is because the radio waves cannot get through the metal cage made by the aluminum foil, it reflects and absorbs the waves. This is also why people sometimes lose reception in a metal elevator.