Sound Energy

What is the matter called that sound waves travel through?

• plasma

• medium

• solid

• none of the above

A sound wave is traveling through a medium.  The intensity of the sound is most affected by the 

• Transparency of the medium

• Material of the medium

• length of the medium

• color of the medium

Placing your ear to the wall allows you to hear sounds from the next room more easily.  This is because 

• The wall supports your ear better

• you are paying more attention

• The wall transmits sound better than air

• sound is reflected by the walls

Which of the following determines the pitch of a sound wave?

• mass

• density

• reflection

• frequency

When a sound wave hits the eardrum, what happens to the eardrum to allow the transmission of the sound to the inner ear?

• it vibrates 

• it ruptures

• it fills with liquid

• `it remains motionless

Once sound vibrations have reached the cochlea, what happens next?

• Electrical signals will be sent to the brain.

• the outer ear will capture the sound waves will vibrate the ear drum

• the outer ear will capture the sound waves

• the brain will interpret the sound

Which part of the ear contains tiny hairs that help translate sound vibrations into electrical signals sent to the brain?

• eardrum

• cochlea

• hammer

• Stapes

Research ships use sound waves to find objects underwater. What happens to the sound waves when they are emitted from the ship?

• THey are absorbed by the water around the ship

• They are reflected off objects they strike in the water

• They are absorbed by the air above the ship

• They are regracted by objects they strike in the water

Even though bats cannot see well, sonar allows them to fly in and out of tight spaces, even at night.  Sonar is a phenomenon of sound that relies on 

• refracted sound

• absorption of sound

• echoes 

• reflected light

What is an echo? 

• a sound absorbed by  materials around it.

• a sound traveling to a listener far away

• a sound changing in frequency

• a sound that repeats, caused by reflection of sound waves