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39 Cards in this Set
- Front
- Back
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The amount of energy in a sound, or the loudness of a sound |
amplitude |
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How high or low a sound is; |
pitch |
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Sound is a form of: |
energy |
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Sound travels in: |
waves |
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How fast something vibrates |
frequency |
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The distance on a wave measured from crest to crest |
wavelength |
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Sound travels slowest through: |
gases |
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Sound travels fastest through: |
solids |
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The pitch of a sound is closely related to: |
frequency |
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High pitch = |
high frequency |
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Low pitch = |
low frequency |
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High amplitude = |
loud sound |
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Low amplitude = |
soft sound |
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A sounds frequency is measured in: |
hertz |
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10 hertz = ____ vibrations per second |
10 |
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100 hertz = ____ vibrations per second |
100 |
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The lowest frequency that humans can hear is: |
20 hertz |
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The highest frequency that humans can hear is: |
20,000 hertz |
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A sounds loudness, or intensity, is measured in: |
decibels |
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Humans feel pain at ____________ decibels |
120 |
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An unwanted sound: |
noise |
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A reflected sound wave creates an: |
echo |
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A place with NO matter, such as outer space |
Vacuum |
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Bats and whales use _________________ to locate food that they cannot see |
echolocation |
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Why do we see lightening before we hear thunder? |
Light travels much faster than sound |
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How fast does sound travel through the air? |
750 mph |
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Soft objects __________ sound |
absorb |
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Which wave is louder, a wave with a small amplitude or a high amplitude |
high amplitude |
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Name several animals that can hear sounds with very high frequency |
bats, dogs, cats, dolphin |
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Name an animal that can communicate with low frequency sounds? |
elephant |
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What do we call sounds with a frequency greater than 20,000 hertz? |
ultrasonic |
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What do we call something that travels faster than the speed of sound? |
supersonic |
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What do we call sounds with a frequency lower than 20 hertz? |
infrasoninc |
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The rapid back and forth movement of something |
vibration |
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In order for sound to occur, something must: |
vibrate |
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A jet traveling Mach 2.0 is going ____ the speed of sound |
twice |
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What is the thin membrane inside your ear that detects vibrations |
eardrum |
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Where do you find the hammer, anvil, and stirrup |
Inner ear |
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The part of your inner ear that controls your balance: |
cochlea |
