SOUND

Lesson 2:  Sound

Vocabulary:  ​In terms of Sound

1. Sound Wave- a disturbance that transfers energy from one location to another longitudinally. 

2. Longitudinal wave- wave that vibrates the medium in the same direction (parallel) in which the waves travel

3. Compression- areas where particles of the medium are close together. (In longitudinal waves)

4. Rarefaction- areas where particles of the medium are far apart. (In longitudinal waves)

5. Frequency- For sound, we call this pitch.  Number of waves that pass in a given amount of time. Example 2 waves/second............We would call this 2 Hertz (Hz)

6. Amplitude- the volume of the sound.  This is determined by how close the wave's longitudinal lines are to one another. 

7. Wavelength- Length from corresponding points of a wave  Corresponding means similar, Ex. Compression to Compression or Rarefaction to Rarefaction

   Key Concepts:  (Cool Stuff About Sound)

• Sound travels faster when the medium is warmer

• Sound travels faster when the medium is more dense

• Ultrasound for viewing babies is the same technology bats and dolphins use.  We can see into the womb safely by using sound waves.

  • We send high frequency waves into the womb and they reflect back to our sensors.  We code this information to produce an image.     

• Echolocation:  Sonar that bats and dolphins use to locate their prey.  The animal will emit a sound, and it will echo off of objects. Different objects bounce sound back in different ways, based on shape and density, so dolphins can see fish in the sand!  Bats are blind, but can "see" bugs in the air!                                                                     

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