Crash Course: Sound

What is a medium (in this context)?

• Gas like air, liquid like water

• Medium, small, large, 

• Medium that can see the future.

Sound is a 

• surface wave

• longitudinal wave

• transverse wave

Sound waves are sometimes called pressure waves.

• True

• False

Just as a diaphragm vibrates on a microphone to send a signal, the __________ in your ear receives waves which will send a signal for your brain to interpret as sound.

• ear lobe

• eardrum 

Pitch corresponds to the amplitude of the wave.

• True

• False

Elephants can communicate using sounds that are __ for humans (too low for us to hear).

• infrasonic

• ultrasonic

When the ambulance moves forward the sound waves are compressed _______ together so you hear a higher sound.

• closer

• farther