can you hear it? (almost) everything you need to know about sound
TRANSCRIPT
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SoundCan You Hear It?
(Almost) Everything You Need to Know About Sound
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Good, Good, Good, Good Vibrations!!!!
Sound is the movement of air. Sounds begin when something
vibrates, or quickly moves back and forth.
For example, a guitar string begins vibrating and a sound is produced.
Another example- our vocal cords vibrate when we talk or sing.
Sound carries energy. This is why loud sounds hurt our ears.
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Moving Sound Sound travels in
waves called sound waves.
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The Speed of Sound Sound travels through different
materials at different speeds. Sound travels through solids faster
than liquids or gases. Check out how fast sound travels
through different materials:• Air- 330 meters per second• Water- 1,500 meters per second• Wood- 4,000 meters per second• Granite Rock- 6,000 meters per second
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Bang That (Ear)Drum!!! How Do We Hear Sound?
Sound goes through the ear canal, hits the eardrum and causes a vibration. The sound enters tubes in the inner ear. Then it travels through nerves to the brain.
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Different Sounds: Why Aren’t All Sounds the Same?
Each sound has a different wavelength. A wavelength is the distance from one area of squeezed particles to another.
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Different Sounds (continued)
Every sound has a different frequency. Frequency is the number of times a sound source vibrates in one second.
Frequency determines pitch, or how high or low a sound is.
Fast vibration = high frequency = high pitch
Slow vibration = low frequency = low pitch
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Different Sounds (continued)
Amplitude is the amount of energy in a sound wave.
High amplitude = high loudness or volume