Sound Energy

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

Tags

NGSS.MS-PS4-2

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

Tags

NGSS.MS-PS4-2

A police car's siren changes in frequecy as the car travels away. What happens to the sound's frequency?

• it decreases
• It does not change
• it increases
• it increases or decreases depending on the car's speed

Tags

NGSS.HS-PS4-1

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

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

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

Tags

NGSS.MS-PS4-2

The hammer, anvil, and stirrup are three bones that act as levers to increase the size of vibrations in which part of the ear?

• outer ear
• middle ear
• eardrum
• inner ear

How does cupping your hand around your ear help you hear?

• Sound waves move through the hand into the ear
• sound waves have more air to move through to get to the ear
• more sound waves are regracted into the ear
• The hand reflects more sound waves into the ear

Tags

NGSS.MS-PS4-2

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

Tags

NGSS.MS-PS4-2

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

Tags

NGSS.MS-PS4-2