sound & waves
DESCRIPTION
Sound & Waves. A primer for Animals & hEaring. Sound is Vibration. Vibrations create Waves. Characteristics of Waves. Amplitude. Characteristics of Waves. Characteristics of Waves. Frequency in a Sound Wave determines Pitch. Describing Waves (rope demonstration). Frequency Amplitude - PowerPoint PPT PresentationTRANSCRIPT
Sound & Waves
A primer for Animals & hEaringSound & Waves
Sound is Vibration
Vibrations create Waves
Characteristics of Waves
Amplitude
Characteristics of Waves
Characteristics of Waves
Frequency in a Sound Wave determines Pitch
Describing Waves (rope demonstration)
Frequency
Amplitude
Wavelength
Period = the time between the wave crests
Describing Sound
Frequency = Pitch
Amplitude = Volume (how loud it sounds)
What is the term for reflected sound?
Tuning Forks & FrequencyWhich tuning fork will have a higher pitch?
UNITSFrequency is measured in Hertz
Hertz = Cycles per Second, ie. the number of S curves in one second.
These Tuning forks create sounds with frequency 256 Hz & 512 Hz.
Tuning Forks & FrequencyWhich tuning fork will have a higher pitch?
UNITSFrequency is measured in Hertz
Hertz = Cycles per Second, ie. the number of S curves in one second.
These Tuning forks create sounds with frequency 256 Hz & 512 Hz.256 Hz512 Hz
Not all Frequencies of Vibration can be Heard
Day 2 Materials4 StethocopesTuning forksEar funnel setupFlour baggie/watch/air baggieSlinkyFunnel/milk jug to hold up to the ear
Describe this wave in terms of frequency, amplitude and wavelength.
Day 2: Movement of SoundSound Waves Travel through:GasesLiquidsSolids
Sound does NOT travel through a vacuum.
It requires a medium. Air is the medium for this sound wave
Compression Wavehttp://www.acs.psu.edu/drussell/Demos/rad2/mdq.html
http://en.wikipedia.org/wiki/File:Onde_compression_impulsion_1d_30_petit.gifA Slinky Can be a Hands On model of movement of a Compression Wave
If sound is a compression wave,which medium do you think it will move faster through?
Sound travels more efficiently through solids than gases. The sound of the ticking watch will be louder through the flour than through the air.
Which will be louder?
Sound travels more efficiently through liquids than gases
Speed of SoundSubstancemeters/secmiles/hoursvacuum00Carbon dioxide270604Air340760Hydrogen1,3202.950Water1,4703,290Glass5,00011,180Iron5,12011,450Direction of SoundThe brain interprets direction from which a sound orginates by the difference in time it takes to get to each ear.Amplify SoundIf sound is created by vibrations, what is a strategy for making a sound louder?