1. OBJ: Given hands-on activity notes and guided reading booklet SWBAT explain what is sound and an echo as well as the factors that affect the speed of sound with 70% accuracy. DN: tuning fork-water-tack hands-on activity ACT: Introduction to sound, echo, speed of sound Video: Longitudinal and Transverse Waves iPad- eSpark Assignment Text, read p , Work on Nature of Sound Booklet; HW check-WES Activity Sheet HW: Complete Nature of Sound booklet; Study for SVQ1 Quiz (absorb-environment); Work on WES Review Sheets; WES Exam, Nov 19

2. ACTIVITY
Strike your tuning fork and Touch the water Touch the tack and Touch your nose.

3. LESSON NOTES
Sound: a disturbance that travels through a medium as a compressional (longitudinal) wave.
Cause of Sound: a vibrating object; vibrations push air particles together (compression) and spread air particles apart (expansion); travels as a series of expansions and compressions through the air as a sound wave.

4. Sound Waves = series of expansions & compressions of air molecules

5. LESSON NOTES
Echo: sound wave reflected off of a surface. Example: in a cave.
Speed of Sound:
effected by elasticity,
density and temperature of the medium

6. ELASTICITY
Definition: ability of a material to bounce back to its original shape.
Sound FAST – solids, why? elastic
Sound SLOW – gas, why? Not elastic

7. TEMPERATURE Definition: A measure of the amount of heat in a material.
Sound FAST- hot
Sound SLOW – cold
At high altitude (cold), sound moves slowly; Chuck Yeager broke the sound barrier (sonic boom).
*** Complete Nature of Sound Booklet ***