Clark
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- Light waves
- *electromagnetic waves
- Medium Seismic waves
- travel through rocks and other materials inside the Earth
- Sound waves
- *longitudinal waves *travel fastest in a rock *travel in air *depends on the medium
- Crest
- high point of wave
- Amplitude
- is how long a sound and the amplitude of the waves
- Differences in wave speed
- white light breaks up into different colors when it passes through a prism
- Infrared rays
- type of radiation in the electromagnetic spectrum mainly transfers thermal energy
- Radio waves
- *scientists use this energy to communicate with satellites in space *have longest wavelength *don't require a medium
- Wavelength
- the distance between two crests of a wave
- Relationship between sound movements and state of matter
- sound moves best through solids because there are more particles of matter to vibrate
- When energy is absorbed
- molecules vibrate harder and the energy is spread over many molecules and disappears
- Vibrating particles produce sound and transfer energy
- *when a opera singer shatters a glass with her voice *when vibrations of the bass sound in a song cause another object to vibrate *when ultrasound vibration is used to clean jewelry
- Reflection
- *is the bouncing of a wave off of a surface or boundary which can be fixed or free *when a wave bounces back when it hits a surface
- Diffraction
- bending of wave around an edge, or effect of white light separating into different colors
- Reducing echoes in buildings
- curtains, carpets, and textile prints on walls
- Wavelength of a sound wave or visible light wave
- determine is pitch or color
- Refraction
- bending of a wave as it passes from one medium to another medium, or when light passes from air to glass, the light may change direction
- UV light
- *has most energy and is most dangerous *is an electromagnetic wave
- Waves transfer
- energy but not matter
- Microwaves
- is longitudinal wave (motion goes in same direction as the wave)
- Causes of waves
- *vibrations *all waves are repeating or periodic
- Noise of jackhammer decrease further you get away from it
- wave energy spreads out over a greater area as it leaves the source, so intensity decreases with distance
- Sonar system
- measures distance by determining the time it takes for sound waves to bounce off a surface
- Under green light, what color is a red flower with green leaves
- flower would be black with green leaves
- Color that an object appears to be depends on
- wavelength of light that the object reflects
- Light rays
- that pass through a lens change direction because light travels faster through air than through glass
- Doppler effect
- cause the change in pitch when you a train whistle at different points
- Temperature
- affect the speed of sound
- X-rays to treat cancer
- *uses energy levels that are high enough to kill cancer cells *are a type of electromagnetic radiation that is used to show bones, teeth which can affect our health
- Ultrasound
- is type of transverse wave
- Microwaves
- are type of electromagnetic radiation that can be used with radar as doppler to predict weather