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Can you hear me now?

Can you hear me now?. Sound principles to live by. https://www.youtube.com/watch?v=GkNJvZINSEY&feature=youtube_gdata. I Can... 1. Describe the states of matter. 2. Explain how sound travels and compare it to light 3. Describe and compare Amplitude and Frequency.

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Can you hear me now?

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  1. Can you hear me now? Sound principles to live by.... https://www.youtube.com/watch?v=GkNJvZINSEY&feature=youtube_gdata

  2. I Can... 1. Describe the states of matter. 2. Explain how sound travels and compare it to light 3. Describe and compare Amplitude and Frequency

  3. Finding your way through unfamiliar territory... journey to personal growth 0 ( I'm lost) 1 ( I see footprints) 2 ( I see a path) 3 ( I see pathways) 4 ( I know my way around) 5 ( I can help others find their way) I can ... Goal 1. (G1) Describe states of matter Beginning of class ____ End of class ___ **Plot yourself on the Timeline ** Goal 2. (G2) Describe how sound travels and compare to light Beginning of class ____ End of class ___ **Plot yourself on the Timeline ** Goal 3. (G3) Compare frequency and amplitude Beginning of class ____ End of class ___ **Plot yourself on the Timeline **

  4. Sound occurs where there is vibrating matter! **Side Tracked... Matter(exist in 3 states---solid liquid and gas)...and is anything that has mass and takes up space It can be observed to have characteristic or 
physical features that help define and describe the matter... 1. Luster ? ....shiny (metallic) or dull

  5. 2. Does it allow light to pass through? Transparent...light passes through easily and 
you can see through it clearly Translucent...light can pass through it but it looks cloudy or milky to the observer Opaque... light can not pass through it... it bounces off this object...behind this object will be a shadow made from the 
absence of light

  6. 3. Hardness-Moh's scale....1 soft.....10 very hard 4.Density...How tightly the objects molecules are 
packed together...(mass packed in area of volume) Time to rattle your world! How come a 100 lb rock sinks and a 5000 lb log 
floats? ---sinking and floating happen due to density and not because of weight

  7. Sound must travel through matter because there must be 
vibration There are regions in the air where the air particles are 
compressed together and other regions where the air particles 
are spread apart. These regions are known as compressions and rarefactions

  8. Sound therefore moves the fastest through a solid and slowest through a gas because molecules are closest together in a solid and 
farthest apart in a gas... solid gas liquid

  9. Sound travels in waves.... http://www.youtube.com/watch?v=vNuDxc9tZMk

  10. Catching a WAVE A wavelength is measured from crest to crest.. trough to trough....or starting point to starting 
point

  11. Sound waves travel in all directions at the 
same time---the puddle effect sound

  12. It's Batty but Sound BOUNCES !!! Sound bounces best off of smooth flat surfaces that are hard...that is why 
you can hear a teacher's high heels in the hall. Soft surfaces that are irregular absorb sound and reduce any echoes ..

  13. Humans and other creatures use sound waves 
to "see" their way through the world. Echolocation--- bouncing sound off objects and 
using the echo (returning) sound to hunt and 
locate prey in the water or dark

  14. Humans use ultra sound to see in the human 
body and we use sonar under the water

  15. Frequency---How often a wave crest goes by in a 
specific amount of time Short wavelengths = high frequency = high pitch or high sounding (violin) Long wavelength = low frequency =low pitch or low sounding (cello)

  16. How do you produce high frequency or pitched 
sounds? The rule: the faster an object vibrates the higher 
the pitch---so 1. the tighter the string the higher the pitch 2. the shorter the string the higher the pitch 3. the thinner the string the higher the pitch Just the opposite is also true: the slower an 
object vibrates the lower the pitch---so 1. loosen the string 2. lengthen the string 3. thicken the string

  17. https://www.youtube.com/watch?v=YTZcSaPn92s Frequency is measured in Hertz...vibrations per second. Humans can hear 20 hertz to 20,000 hertz...bats 
using echolocation can hear up to 120,000 hertz The Doppler effect...the pushing and pulling of 
sound http://www.youtube.com/watch?v=h4OnBYrbCjY

  18. Loud and soft sound are determined by the 
amount of energy used to create them loud soft

  19. A sounds loudness is measured in decibels The more energy put into the sound the 
louder its amplitude or loudness

  20. SO......closeness of wave = frequency(pitch) high low height of wave = amplitude(loudness) soft loud

  21. Sound can have pitch and amplitude Loud and high 
pitched loud and low pitched

  22. soft and high pitched soft and low pitched

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