Sound: Lesson 59 Review of Sound Expectations: 1. Listen carefully 2. Work hard 3. Be responsible.

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Presentation transcript:

Sound: Lesson 59 Review of Sound Expectations: 1. Listen carefully 2. Work hard 3. Be responsible

Review: Sound is a type of energy made by vibrations. When any object vibrates, it causes movement in the air particles. These particles bump into the particles close to them, which makes them vibrate too, causing them to bump into more air particles. This movement, called sound waves, keeps going until they run out of energy. If your ear is within range of the vibrations, you hear the sound.

Trivia Questions Can Sound travel under the water? Is there sound on the moon? What do fast and slow vibrations sound like?

Trivia Questions Can Sound travel under the water? Yes, sound can travel under the water. It moves four times faster through water than through the air. Is there sound on the moon? No, there is no sound in space. Sound needs something to travel through like air or water. What do fast and slow vibrations sound like? Fast vibrations make a high pitch sound, and slow vibrations make a low pitched sound.

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Ways to Make Sound

How Wind Instruments make sounds In wind instruments vibrating air makes the sound. The air particles move back and forth creating sound waves. Blowing across a flute's blow hole sets up slinky-like waves in the tube. In the clarinet, a vibrating reed (a thin piece of wood set in the mouthpiece) gets the waves started. Different pitches are played by pressing keys that open or close holes in the tube making the air column inside the tube longer or shorter. Longer air columns produce lower pitches.

How Plucking Instruments make sounds Stringed instruments are played by pressing the fingers down on the strings. This pressure changes the strings' length, causing them to vibrate at different frequencies and making different sounds. Shortening a string makes it sound higher. Strings produce different sounds depending on their thickness.

Assignment: index/15-science/88-sound.html Read the fast facts for review then choose at the bottom to review some more. Review and prepare for your quiz on sound!

I had fun reviewing and working with you today! Keep your eyes and EARS open, scientist! I will see you next lesson.