Post on 31-Mar-2015
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VocabularyHow Sound is Made &
Travels
Features of Sound
Factors affecting
Pitch
Reflect and Absorb
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What is pitch?
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The highness or lowness of sound
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What is volume?
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The loudness of sound
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What is amplitude?
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The height of a sound wave (the volume)?
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What is timbre?
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The quality of sound
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What is kinetic energy?
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Energy in motion
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What do you need in order to start any sound?
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Energy
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All sound is caused by …
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vibrations
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First you need energy to create a vibration. Then the molecules of the object vibrate. What happens next?
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The vibrations of those moving molecules are transferred to the
air molecules.
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Sound travels in what form….
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Sound waves
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Sound cannot travel in this medium
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A vacuum (space is an example of a vacuum)
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If I blow the top instrument, then the bottom one, I’ve made a change in
frequency or amplitude?
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Frequency. The difference in length affects the pitch (which is
the same as frequency).
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If I increase the amplitude I am increasing the volume – true or
false?
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True! Amplitude & volume are related
Remember, “Amp it up!”
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If I increase the intensity, I’m also increasing the_____ of the sound.
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Energy, volume, amplitude(any or all is acceptable)
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Sing ONLY the first two words – “twinkle, twinkle” of
“Twinkle, Twinkle Little Star.
You’ve just made a change in ________
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Pitch or frequency
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The faster an instrument vibrates, the higher the __________ of the sound
it makes.
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Pitch or frequency
Think: it’s vibrating more frequently, so it’s increasing its
frequency
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What sounds higher in pitch, a wide rubber band or a thin rubber band?
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A thin rubber band
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What‘s lower in pitch, a tight string or a loose string?
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A loose string
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What’s higher in pitch, a long organ pipe or a short one?
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A short one
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If I do this to the drum skin, I will make it sound higher in pitch
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Tighten it
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If I decrease the pitch, I am also decreasing the _______ of sound
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Frequency
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Reflect means….
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To bounce off of something
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Absorb means….
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To take in or soak in
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Which reflects sound best? A brick wall or a stack of books.
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A brick wall
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Which absorbs sound better, a carpet or a wall?
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A carpet
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In most cases, the better room for an echo is the family room or the
bathroom? Why?
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The bathroom. Places that are empty with flat surfaces and not a lot of soft
things to absorb sound reflect best. A family room will likely
have carpet, sofas, several people. A bathroom has tile, flat, hard surfaces, and not a lot in it
to absorb sound.