How Sound Travels & Sound and the Ear Quick Check

Unimpeded, sounds ______ as they get farther and farther away from the original source.

Sound travels in ______, or compression, waves.

In the mid-1600s, ______ noted the absence of sound as he pumped the air out of a jar containing a ringing bell.

In general, we need to realize that sound must have a medium through which to travel, its speed varies according to the ______, and ______ travels significantly slower than light.

Microbats generate ultrasound from the ______ and emit the sound through the ______ or mouth.

What is the frequency range (in hertz) for a microbat call?

• 14,000 to over 100,000 Hz

• 1,400 to over 10,000 Hz

• 4 to over 1,000 Hz

• 4,400 to over 140,000 Hz

Approximately how fast does sound travel through air?

• 330 meters per second

• 33 meters per second

• 30 meters per second

• 3,330 meters per second

Through what medium does sound travel the fastest?

• solids

• liquids

• gases

• vacuum

Match the following

• reflections of sound waves

• echoes

• bounced of

• reflected

• used by whales and elephants

• echolocation

• sounds above the human range of hearing

• ultrasonic sounds

• used to navigate and locate food

• infrasonic sounds

The _______ is a thin, translucent, connective tissue membrane, covered by skin on its external face and internally by a mucous membrane.