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30 Cards in this Set
- Front
- Back
- 3rd side (hint)
What is sound?
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Sound is a disturbance that travels through a medium as a longitudinal wave.
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In what direction do longitudinal waves move?
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up and down
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What three factors does the sound of speed depend on?
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elasticity
density temperature of medium |
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The ability of a material to bounce back after being disturbed
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elasticity
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What is how much matter or mass, there is in a given amount of space or volume called?
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density
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What are the three states of matter
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solid, liquid, gas
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you learned this in 6th grade
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When air rushes by your vocal cords, it causes what to vibrate?
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Larynx
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Why is it that sound cannot travel through space?
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There are no air particles in outer space, there is nothing for a longitudinal wave to pass through.
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How does sound travel through a medium?
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A vibration creates compressions and rarefactions in the medium near the source of sound.
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What is a compression?
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The part of the wave when the particles are close together
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What is a rarefaction?
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The part of the wave where the particles are far apart.
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How do you hear sound?
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The outer ear funnels sound waves, the middle ear transmits the waves inward, and the inner ear converts the soundinto a form that your brain can understand.
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What is a few centimeters long and ends at the eardrum?
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ear canal
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The middle ear contains the three smallest bones in the human body.. name them
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hammer
anvil stirrup |
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Where are the three smallest bones of the body located?
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Ear
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A cavity shaped like a tiny shell is called the _______.
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cochlea
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What is lined with more than 10,000 tiny hairs?
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cochlea
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How do your outer ears detect sound?
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They focus sound waves into the ear canal.
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How can sound damage your hearing?
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Loud sounds can damage some of the hairs in the cochlea.
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What happens once sound waves enter the ear?
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Vibrations move the hammer, which moves the anvil, and the stirrup. The stirrup vibrates against a membrane of the inner ear causing fluid to vibrate, stimulating tiny hairs which are connected to nerve cells.
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What is sonar?
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A sonar device sends out waves and measures the time it takes to detect the reflected sound waves.
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List three ways animals use sound waves to communicate?
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to navigate
to find food to communicate |
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What does it mean to navigate?
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To find it's way
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How do doctors use ultrasound?
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To " see inside" the human body, and diagnose and treat medical conditions.
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What is echolocation?
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The use of sound waves to determine distance or to locate objects.
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Give two examples of animals that use echolocation.
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bats
dolphins whales |
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When elephants stomp on the ground , what type of sound is being produced?
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infrasound
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When a dog trainer calls a dog what type of sound is being used?
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infrasound
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How can ultrasound be used in medicine?
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To look inside the body
to destroy unwanted tissue to check a fetus |
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Sonar can be used in the ocean how?
Give two examples |
to locate sunken ships
to find schools of fish to determine how deep water is |
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