Can you hear me now?
Sound principles to live by....
I understand how sound travels and interacts with objects in the environment
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Study guide:
1. In a written paragraph, I can tell the similarities between the different states of matter and I can
tell their differences.
2. 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)
3. I can draw and explain the difference between high and low frequency sound waves
4. I can draw and explain the difference between soft and low sounding waves
5. I can draw and explain what a loud, low sound look like and what a soft , high pitch sound looks
like. ( Buddy task)
6. What is the difference between Hertz and Decibels?
7. On a Guitar, name and explain 3 ways to make the top string sound higher.
Sound occurs where there is vibrating matter!
Matter... What is that?
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)
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
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?
Answer…sinking and floating happen due to density and not
because of weight
A video you simply must see and hear!
https://www.tes.com/lessons/Z90ij5qPhf9D2A/edit
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
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
Sound travels in waves....
Catching a WAVE
A wavelength is measured from crest to crest..
trough to trough....or starting point to starting point
Sound waves travel in all directions at the same time---the
puddle effect
sound
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
..
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
Humans use ultra sound to see in the human body and we use
sonar under the water
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)
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
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://en.wikipedia.org/wiki/Doppler_effect
Loud and soft sound are determined by the amount of energy
used to create them
loud
soft
A sounds loudness is measured in decibels
The more energy put into the sound the louder its
amplitude or loudness
SO......closeness of wave = frequency(pitch)
high
low
height of wave = amplitude(loudness)
loud
soft
Sound can have pitch and amplitude
Loud and high
pitched
loud and low pitched
soft and high pitched
soft and low pitched
https://www.tes.com/lessons/Z90ij5qPhf9D2A/edit
https://quizlet.com/115291237/flashcards
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