Download Destructive interference - Thomas C. Cario Middle School

MECHANICAL WAVES
Sound
Water
Seismic Waves
REQUIRE A MEDIUM TO VIBRATE IN
ORDER TO TRANSMIT ENERGY.
STANDING WAVE
 a vibration which some particular points
remain fixed while others between them
vibrate with the maximum amplitude.
Fixed points=
Nodes
Acoustic Levitation
TWO-SOURCE INTERFERENCE
 Constructive interference occurs when the
crest of one wave meets the crest of a second
wave, to produce a "super-crest.“ Or the trough
of a wave meets the trough of another wave.
Constructive Interference
TWO-SOURCE INTERFERENCE
 Destructive interference occurs when the
crest meets with a trough.
Destructive interference decreases/cancels out
the resulting wave.
Destructive
Interference
EAR ANATOMY
1. Ear Lobe
2. Ear Canal
3. Ear Drum
4. Stirrup 5. Vestibule
6. Eustachean tube
7. Cochlea 8. Semicircular canals
9. Anvil
10. Hammer
EAR ANIMATIONS
How old are YOUR ears?
How hearing works
Hearing Brain Pop
Ruptured/
Damaged Ear
Drum
MISSING COCHLEA HAIRS
As you get older, not only does the hair
sometimes fall out on your head, but also in your
ears!
SWIMMERS EAR
 Inflammation of the Ear Canal
PITCH AND FREQUENCY
Dog Whistle
Tuba