Investigating Sound by Sally M. Walker
Author:Sally M. Walker
Language: eng
Format: epub
ISBN: 9781512475937
Publisher: Lerner Publishing Group
Sound waves move
through wood even
faster than they move
through water.
22
You can prove that
sound moves faster in
a solid than in a gas.
Experiment Time Again!
Test the speed of sound in
a solid wall. Ask a friend to
stand at one end of a room.
Stand at the other end.
Ask your friend to tap the
wall with a pen.
The sound you hear
is not very loud. The air
molecules between you and
your friend carry the sound
wave slowly. The sound
has time to spread out and
get weaker. Put your ear
against the wall. Listen
again. The taps are much
louder. Why? The sound
waves move quickly through
the wallâs tightly packed
molecules. The sound does
not have time to spread out
and get weak.
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