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light , sound , waves & reflection
Transcript of light , sound , waves & reflection
Waves are produced and detected
by vibration, similar to a persons vocal cords.
1.Muscles push air up from your lungs.
2.Air travels through the opening between the vocal cords.
3.The air causes the vocal cords to vibrate back and forth.
4.The vibrating vocal cords produce sound waves.
5. Particles in the air vibrate back and forth transferring the sound
through the air.
6.The funnel shaped ear focuses the sound into the ear canal.
7. A tiny tube called the ear canal transfers the sound into
the middle ear.
8. In the middle ear the sound waves cause the ear drum to vibrate.
9.Vibrations then travel tiny bones in your inner ear called
the hammer, anvil, and stirrup to the inner ear.
10.The tiny hairs in the cochlea detect the sound vibrations.
11.The sound waves are sent to the brain as electrical signals
12.The brain receives the signals and processes them
as sound Sound waves are different
from other waves,
because sound waves
are longitudinal. 5+7= (cc) image by anemoneprojectors on Flickr Air at 20 degrees Water at 20 degrees Steel at 20 degrees Gas (slowest) Liquid (medium) Solid (fastest) Medium State 769 mph 3,130 mph 11,200 mph Reflection Example: Sound A wave at a 90 angle Traverse Wave Example:
Anything except sound; baseball breathing, movement etc. Longitudinal wave A wave that goes in the same direction as the medium. Refraction Diffraction Part 2 Part 3 Part 4 Part 5 Part 6 Part 7 Part 9 You increase the intensity of a wave by adding more force. Part 8 HI!!!!!!!!!!!! ~ low pitch. High pitch What: An image being multiplied backwards
Why: When the wave strikes the barrier, it is reflected backwards What: The change of direction of a ray of light, sound or heat in passing from one medium into another in which its wave is different.
Why: It does this because it goes into a different medium. What: The bending of waves, especially sound and light waves, around obstacles in their path.
Why: It does this because it needs light, sound or air through a narrow opening. Market User Repeat user Some Many Few potential Visitor (cc) photo by twicepix on Flickr (cc) photo by tudor on Flickr One Two Three Four (cc) image by rocketboom on Flickr (cc) image by quoimedia on Flickr Medium Medium Electromagnetic Outer space Water Ground material
type mechanical Air Any empty space Speed of Sound When waves happen more frequently, the pitch is higher. The less frequent the waves happen, the pitch is lower.