A Path for Sound
You will need: Thread, spoons, fork, small cans, and water glass.
Strike the end of a fork on
the table and perhaps, very faintly, you may hear a noise like a tuning fork.
Strike the fork a second time, however, and quickly touch the handle to an
empty water glass, and the sound will be magnified.
When you drop something on
the floor, the noise it makes must pass through the air to reach your ears, and
some sound waves will never reach you.
Tie a fork to the center of
a length thread to your ears and lean forward from the waist so that the fork
swings freely in front of you. Let a friend strike sharply at the fork with
another fork or spoon. The noise produced will travel along the thread and you
will hear it quite loudly.
Now tie a spoon on each
side of the fork. This time, when the spoons and fork are struck you will hear
a pleasing sound resembling a peal of bells.
Try suspending small tin
cans and other metal objects from the thread. Strike first one, then another,
then all together. What noises do you hear?