Front

What is a sound that bounces off a surface and travels back to someone's ears?

Back

echo

Front

What are vibrations that you can usually hear with your ears?

Back

sound

Front

What is a pretend version of something that scientists use when the real thing is too big, small, or complicated to work with?

Back

model

Front

What is a test used to discover new information about a question?

Back

experiment

Front

What is a quick movement back and forth?

Back

vibrations

Front

What is the term for the distance between the top of one wave and the top of the next wave?

Back

wavelength

Front

What do we call the number of waves that pass a point in one second?

Back

frequency

Front

What is the term for the way sound travels through different materials?

Back

sound propagation

Front

What is the unit of measurement for sound intensity?

Back

decibel (dB)

Front

What is the term for the change in pitch of a sound as the source moves closer or farther away?

Back

Doppler effect