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20 Cards in this Set
- Front
- Back
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What does VIBRATE mean?
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moves rapidly back and forth
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How is sound produced?
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When an object vibrates.
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What does a vibrating object
need in order to produce sound? |
matter
(gas or liquid or solid) |
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What spreads outward from an
object that is vibrating in matter (gas, liqid or solid)? |
sound WAVES
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Does the air move outward in all
directions to form a sound wave? |
no
only the DISTURBANCE of the molecules of air moves outward |
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Sound waves become ________ as
they travel away from the source of sound. |
weaker
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Sound waves _______ ( DO or
DO NOT) travel through all three states of matter. |
DO
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Sound waves travel _______ through gases,
_________ through liquids, and _________ through solids. |
slowly
faster fastest |
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Sound waves can travel only
when there are _______ __ ______ to transit the vibrations. |
molecules of matter
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Sound waves _______ (CAN or
CAN NOT) travel through empty space. |
CAN NOT
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Sound waves travel through
air at a speed of about _____ feet per second. |
1,100
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Light travels at a speed of
________ miles per second. |
186,000
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Why do you see see a flash of
lightning before you later hear the sound of thunder? |
because light travels so much faster than sound
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What do we call the boxlike
chamber in the air passageway in our throat? |
larynx
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What do we call the two stretchy
bands of tissue in the larynx? |
vocal cords
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What happens to the sounds we
make when the vocal cords are stretched tighter? |
the sounds get higher (in pitch)
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How do our vocal cords produce sounds?
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muscles tighten the vocal cords
and air from the lungs passing by make the vocal cords vibrate |
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Sound waves travel best through:
A. air (gas) B. water (liquid) C. steel (solid) |
C. steel (and other solids)
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To vibrate means to move very
________ (SLOWLY or RAPIDLY). |
RAPIDLY
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Sound travels ________ (REALLY WELL
or NOT AT ALL) through empty space. |
NOT AT ALL
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