A wave in which particles move in the same direction as the wave.

• longitudinal wave
• light ray
• echo
• pitch

Perception of how high or low sounds seem.

• longitudinal wave
• light ray
• echo
• pitch

Transparent object with at least one curved side that causes light to change direction.

• cornea
• lens
• retina
• iris

Layer of light-sensitive cells in the back of the eye.

• retina
• pupil
• cornea
• lens

Material through which light does not pass.

• transparent
• translucent
• opaque
• lens

Any reflecting surface

• lens
• mirror
• transparent
• pupil

The function of the bones in the middle ear is to overtone sound waves.

• True
• False

Bats use reverberation to locate insects.

• True
• False

Loudness is how high or low a sound seems.

• True
• False

The purpose of the inner ear is to interpret sound.

• True
• False