notes pb lab 08 sounds cool
TRANSCRIPT
Sounds CoolSounds CoolExploring Sound waves
http://www.youtube.com/watch?v=_ovMh2A3P5k
Key Objectives:Key Objectives:
The student will investigate and understand the interactions of sound waves– Comprehend that resonance causes a
second object to vibrate at the same frequency
– Recognize everyday examples of sound waves that demonstrate constructive and destructive interference
Key TermsKey Terms
ResonanceInterference
Resonance
When sound waves travel in phase– Can result in other objects
vibrating at the same frequency– Glass vibrating and then
breaking when a soprano sings
Interference
The combination of two or more waves that results in a change in sound quality
If it improves sound quality, it is called positive interference
Interference
The combination of two or more waves that results in a change in sound quality
If it lessens sound quality it is called destructive interference
Essential LearningsEssential Learnings
Carefully read and copy each of these down after we discuss them!!!!!
Essential LearningsEssential Learnings
All sound travels in longitudinal waves with a clear discernible and graphable pattern of compressions and rarefactions
http://www.youtube.com/watch?v=27a26e2CnuM
Essential LearningsEssential Learnings
The speed of sound through a material depends on the type of material– More dense the material (solid),
the faster sound waves travel– Less dense the material (gas),
the slower the waves travel
Essential Learnings
Sound waves may be reflected from dense forms of matter.– Sonar
http://www.youtube.com/watch?v=Z_E3zxx2l9g
– Ultrasoundhttp://www.youtube.com/watch?
v=VJKc9WE7OaM
Essential Learnings
When sound travels in phase, it is called resonance.– If it improves the sound quality it is
called constructive interference– If it decreases sound quality it is
destructive interference
Essential Learnings
Constructive interference happens when rarefactions and compressions combine to increase sound quality (working together)
Essential Learnings
Destructive interference happens when rarefactions and compressions cancel each other out (working in opposition) eliminating any sound
Essential LearningsEssential Learnings
The End!