Section 3 Behavior of Waves - Springfield Public …Sound waves are about 1 to 2 feet across; a door...
Transcript of Section 3 Behavior of Waves - Springfield Public …Sound waves are about 1 to 2 feet across; a door...
Reflection When a wave strikes an object and bounces back.
Reflection in a mirror: Light hits your face and bounces off to a mirror which bounces off and is directed towards your eye.
Echo A reflection of sound waves
Bats and dolphins use echo-location to navigate through their environment.
Law of Reflection Incident beam- light hitting
mirror
Reflected beam- light bouncing off of mirror
Angel of incidence is equal to the angle of reflection.
Refraction Bending of a wave caused by the change in its
speed. Light moving through a gas to a solid can cause
refraction
Refraction of light in water Light travels at different speeds in water and air.
This causes refraction of the light.
Objects appear in different places then they actually are when this occurs
Diffraction When an object causes a wave to change direction
and bend around it.
When waves pass around an object
Diffraction and wavelength If the object is smaller than the wavelength the
wave diffracts around it.
If the object is larger than the wavelength the wave does not diffract around it very much
Hearing around corners You can hear sounds around a corner due to the
diffraction that takes place with the sound waves. Sound waves are about 1 to 2 feet across; a door is
about 3 feet. This allows some of the sound waves to diffract
through a doorway.
Light will not diffract around a corner due to the short wavelength of light. Light has a λ of 300 to 900nm; this means light
does not diffract around corners of a hallway.
Diffraction of radio waves AM radio waves have shorter wavelengths than FM
radio waves; this means they can diffract around buildings, hills and other objects. This gives AM stations better reception.
Destructive interference Waves subtract from one another
When the crest of one wave meets the trough of another
Standing waves A wave pattern that
forms when waves of equal wavelength and amplitude travel in opposite directions and interfere with each other.
Standing waves in music Vibrations of a bow string and a violin create
standing waves from the vibrations.
Flute creates a standing wave in a column of air.