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Today is Tuesday, May 7 th , 2013

Today is Tuesday, May 7 th , 2013. Homework: Homework Packet Due this Friday Finish Reading Ch. 14 by Friday Ch. 13-14 Combined Test on Monday, May 13 th Warm UP: Discuss with your shoulder partner: What are some ways that you interact with light and sound in your daily lives?.

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Today is Tuesday, May 7 th , 2013

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  1. Today is Tuesday, May 7th, 2013 Homework: Homework Packet Due this Friday Finish Reading Ch. 14 by Friday Ch. 13-14 Combined Test on Monday, May 13th Warm UP: Discuss with your shoulder partner: What are some ways that you interact with light and sound in your daily lives?

  2. Goal for Today • SWBAT demonstrate the ability to recognize various forms of energy by exploring how sound energy behaves and transfers.

  3. Sound…. • Sound is a vibration that spreads from its source • Must travel through a material; molecules vibrate in a pattern • A basic sound wave: • Compressions – areas where particles are very close together • Rarefactions – areas where particles are far apart • Wavelength – distance between crests • Frequency – measure of how fast particles are vibrating. Greater frequency, higher pitch the sound • Pitch is related to frequency • Decibels – units that measure sounds loudness • Volume is related to amount of vibration. Louder the sound, the higher the crest (or the energy squeezes particles closer together)

  4. Place your hands on your vocal chords. Make a sound. Do you feel it vibrate • Vocal chords cause the air that passes through to vibrate • Where else do you see vibrations when sound is made? • Sound energy can travel through solids, liquids and gases. Can’t travel through a vacuum. Why?

  5. When sound energy reaches the border of a new material, 3 things can happen: 1) bounce back, 2) be absorbed, 3) pass through • Sounds travels at different speeds in different materials and when conditions of a material change • Echo results when sound is reflected back • In a soundproof room, sound is bounced and absorbed. Each time sound bounces, material vibrates and some of the energy is turned to thermal energy • For sound to be heard, the energy from the vibrations must be transferred (through the air to your ear to your eardrum)

  6. Closing it up…. • Let’s see what Tim and Moby have to say….

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