Science Chapter 13

Question Answer
A wave is a distrubance that transfers energy from one place to another.
Water that moves up and down traveling in a wave is known as a disturbance which is transferring energy.
Forces can start disturbances that send waves through a materail. Examples: ropes, water and earthquakes.
Mediums substances which waves move through.
Sound waves move through air.
Mechanical waves move energy through matter
Water, the ground, rope and air are all made up of matter.
Light is a wave that transfer energy through empty space.
Waves caused by an earthquake are good examples of energy transfer
Longitudinal waves travel in the same direction as the disturbance.
Transverse waves travel perpendicular to the direction of the wave.
Waves have amplitude, wavelength and frequency.
Crest highest point of a wave
Trough lowest point of a wave
amplitude from the middle of the wave to the top or bottom of the wave
wavelength distance from one waves crest to the next waves crest
frequency the number of waves which pass a fixed point in a certain amount of time.
As frequency decreases wavelength increases.
Speed= wavelength times frequency
Light waves travel 1,000,0000 times faster than sound waves.
Reflection boucing back of waves
Refraction bending of wave as it enters a medium
diffraction spreading out of waves through an opening
interference meeting and combining of waves
constructive interference is the adding of 2 waves
destruction interference is the subtraction of energy.

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