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 soundVideo: Longitudinal and Transverse Waves

iPad- eSpark Assignment

Text, read p. 36-41, 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

ACTIVITYStrike your tuning fork and . . .

Touch the water

Touch the tack and

Touch your nose.

Touch the water

Touch the tack and

Touch your nose.

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.

Sound Waves = series of expansions & compressions of air molecules

air molecule

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

ELASTICITY

• Definition: ability of a material to bounce back to its original shape.

Sound FAST – solids, why? elastic

Sound SLOW – gas, why? Not elastic

TEMPERATURE

Definition: A measure of the amount of heat in a material.

Sound FAST- hotSound SLOW – cold

At high altitude (cold), sound moves slowly; Chuck Yeager broke the sound barrier (sonic boom).

*** Complete Nature of Sound Booklet ***