A hanger is good to hang clothes on it. Wrong, you can also build an incredible sound-making device from a hanger? Here’s how.
Things Required:
Metal clothes hanger
Kite string
Metal spoon
Two paper clips
Two paper cups
Pair of scissors
Pushpin
Directions:
Use a pushpin to punch a hole into the bottom of a paper cup. Cut two segments of kite string, each about 2 feet long. Pass one of the segments through the cup hole. Tie the end of this string segment that exits the inner side of the cup to a paper clip.
Repeat the above steps with another cup. When you’re finished, you should have two listening devices that look as if they were cut from a string telephone.
Tie the free end of both strings to the hook of a metal hanger. Place each cup over your outer ear. Make sure the hanger dangles freely.
Ask a friend to tap the hanger gently with a metal spoon or similar object. What do you hear?
This Is What Happens:
Sound travels very well through solid materials. When the hanger was struck by the spoon, it vibrated. These vibrations were transferred to the string. The string carried these back-and-forth movements to the cups. There, the vibrating cup bottoms set the air space in motion.
As the particles of air vibrated within the cup, they struck your eardrum. You detected this movement as sound. Since the sound travelled along the solid string, it contained much of its original energy and produced a noise that sounded like the ringing of a huge bell.
