How high or low a sound is is the ____________.

A back-and-forth movement of matter is its _____________.

The number of vibrations per second is the _____________.

The loudness of a sound is the __________________.

The more energy a sound has, the greater its _______________________.

Sound is measured in units called __________________________.

The softest sound a human can hear is ____________ dB.

Sounds above ____________________ dB can cause pain and can damage a person's ears.

Sound travels through the air as ____________________________.

A sound that bounces off a surface is called an ________________________.

The longer the string, the _____________________ the sound.

Sound travels best through ____________________.

Why can't sound be heard in space?

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