Getting Ready for Notes Do your Warm Up. Be prepared to discuss with the class. Set up your IAN Notebook with Cornell Notes like the picture below.

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Presentation transcript:

Getting Ready for Notes Do your Warm Up. Be prepared to discuss with the class. Set up your IAN Notebook with Cornell Notes like the picture below.

Sound Waves

Check This Out!

Mechanical Waves Mechanical Waves – waves that need a medium to transport energy and travel through –EX: Sound, Water, Seismic

Acoustic Waves Acoustic Waves – also known as sound waves Vacuum – No matter exists; empty space where mechanical waves cannot travel

Interacting Particles In a sound wave, air particles interact with each other In a slinky wave, coils interact with each other In a stadium wave, the fans interact with each other

Speed of Sound MediumSpeed SolidFast LiquidMedium Gas (Air)Slow VacuumNone More dense = Faster speed

Speed of Sound As air temperature ↑, the speed of sound ↑ As air temperature ↓, the speed of sound ↓

Pitch Pitch – how high or low a sound seems to be –generated by the frequency of the wave

Amplitude Amplitude – loudness of the sound (volume control)

How Sound is Created Sound (human voice) is created by the vibrations in the vocal cords Human Audio Frequency

Doppler Effect Doppler Effect – the change in frequency and wavelength due to the motion of the source

Doppler Effect Imagine a bug jiggling its legs and bobbing up and down in the middle of a quiet puddle If the bug bobs in the water at a constant frequency, the wavelength will be the same for all successive waves The wave frequency is the same as the bug’s bobbing frequency

Doppler Effect The bug maintains the same bobbing frequency as before However, an observer at B would encounter a higher frequency if the bug is moving toward the observer Each crest has to travel farther than the one ahead of it due to the bug’s motion Each wave crest has a shorter distance to travel so they arrive more frequently

Doppler Effect

Question Is the speed of sound faster or slower in water compared to its speed in air? Faster because it’s a liquid compared to a gas