Sound is a form of _________________ that people can hear. Sound is produced when an object
_________________ back and forth. When an object vibrates, it pushes the air around it, which causes the air to
alternately bunch up and then spread apart. When the air particles bunch up, it’s called a _________________
and when the particles spread apart, it’s called a _________________. These compressions and rarefactions travel
outwards forming a sound _________________. The material that the sound wave moves through is called a
_________________. Without a medium, sound cannot travel and so there is no sound in a _________________
such as outer space.
The _________________ of a sound wave is a measure of how many times an object vibrates per second.
Objects that vibrate with a high frequency produce sounds with a high _________________, which is how our
ears perceive sound.
Sometimes sound waves bounce off a hard, _________________ surface producing an
_________________. Some animals such as bats and whales use echoes to locate prey. Using echoes to locate
an object is called _________________.
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Answer:
Energy
Vibrates
Compression
Rarefactions
Wave
Medium
Vacuum
Frequency
Pitch
Flat
Echo
Echolocation
Explanation:
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