1. Can you hear me now? Sound principles to live by....
I understand how sound travels and interacts with objects in the environment

2. Study guide:
In a written paragraph, I can tell the similarities between the different states of matter and I can tell their differences.
I can draw the parts of a sound wave and explain how sound travels through a medium. (Does it travel fastest or slowest through the atmosphere. (Buddy task)
I can draw and explain the difference between high and low frequency sound waves
I can draw and explain the difference between soft and low sounding waves
I can draw and explain what a loud, low sound look like and what a soft , high pitch sound looks like. ( Buddy task)
What is the difference between Hertz and Decibels?
On a Guitar, name and explain 3 ways to make the top string sound higher.

3. Matter... What is that? Sound occurs where there is vibrating matter!
Review Time! **
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 (Non metallic)

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. Time to rattle your world!
3. Hardness-Moh's scale....1 soft 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?
Answer…sinking and floating happen due to density and not because of weight

7. A video you simply must see and hear!

8. 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

10. 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
liquid
gas

11. Sound travels in waves....

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

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

14. 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 ..

15. 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

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

17. 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)

18. 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

19. Frequency is measured in Hertz...vibrations per second.
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

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

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

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

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

24. soft and high pitched
soft and low pitched

25. Quizlet Blend Space https://www.tes.com/lessons/Z90ij5qPhf9D2A/edit