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Ch 21 Sound

Ch 21 Sound. Mr. Jackson 4-25-11. Sound waves. Sound waves are longitudinal waves. Sound waves travel in all directions away from their source . Detecting sound . The Speed of Sound. The speed of sound is determined by the medium it is traveling in.

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Ch 21 Sound

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  1. Ch 21 Sound Mr. Jackson 4-25-11

  2. Sound waves • Sound waves are longitudinal waves. • Sound waves travel in all directions away from their source

  3. Detecting sound

  4. The Speed of Sound • The speed of sound is determined by the medium it is traveling in. • The more dense the material the faster the speed of sound

  5. Pitch • The measure of how high or low a sound is perceived to be

  6. What we can hear • The Human ear can hear frequencies between 64 and 23000 hertz • See pg 607

  7. The Doppler Effect • When the frequency of a wave changes due to the motion of the listener or the source of the sound. • Ex Train approaching

  8. Loudness • How loud or quiet a sound is • This is the amplitude of the wave • The higher the amplitude the louder the sound is

  9. How to increase amplitude • Most of the time an amplifier is used to increase amplitude • This turns the signal from a Longitudinal sound wave to an electrical signal and then the signal is amplified. The amplified signal is then turned back into a sound wave with a higher amplitude

  10. Measuring Loudness • Loudness is measured in terms of Decibels • Decibels (dB) Range from 0 the softest sound you can hear to over 200 dB. See pg 610

  11. Seeing Amplitude and Frequency • Using an oscilloscope will graph a wave. It will graph all waves as transverse waves

  12. Interaction of sound waves • An Echo is a reflected sound waves • We use echolocation which is the process of using sound waves to locate objects. • Fish finders are one way echolocation is used

  13. Ultrasound • Uses echoes to see inside the body • Uses sound waves with frequencies of 1-10 million Hz

  14. Sound quality • The blending of several pitches through interference

  15. 3 main types of instruments • String, wind and percussion • See pg 619-620 for ex.

  16. Noise • A nonmusical sound that is a random mix of frequencies.

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