Light and sound contain energy in the form of
vibrations. You know that light travels through empty space. Sound
however, can only travel through things that have mass. Sound waves
are actually formed from something that is made out of matter. You
can hear sounds under water, in air, and even through solid doors.
Sound vibrations are in the form of waves.
These waves travel out in all directions. They are composed of air vibrating
back and forth in the direction of travel. You can hear singing coming
from another room because the sounds are coming from someone's vibrating
vocal cords. The vocal cords vibrate the air. The air vibrates
next to your ear and in turn vibrates your eardrum. The vibrating
eardrum vibrates organs inside the ear and stimulates nerves. The
nerves tell the brain that sounds are being heard. Unless a sound
causes air next to the eardrums to vibrate, the sound will not be
Sound waves have wavelengths just as light waves
do. Fast vibrations result in short wavelengths. Slow
vibrations result in long wavelengths.
Sound travels through air at about 1,000 feet per
second. This is over 700 miles per hour.
Directions: Answer the questions about sound.
Sound contains energy in the form of
Which of the following statements is true?
Sound can only travel
through things that have mass.
can travel through empty space.
are formed from things that are made of
can only be heard if air next to the
Fast sound wave vibrations cause
Slow sound wave vibrations cause
Sound travels through air over 700
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