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Science- Book O Ch.1

Ch.1- Energy of Waves

What is a wave? -Travels through medium -Any disturbance that transmits energy trough matter or empty space.
What is a medium Substance in which a wave can travel
What is a mechanical wave Waves that need a medium. (will not transfer energy without one)
What is an example of electromagnetic waves Visible light, microwave made by microwave ovens
What kind of waves do not need a medium? Electromagnetic waves
What are the 2 types of waves Transverse and longitudinal
What are transverse waves Wave in which the particles in that wave move perpendicularly
What are longitudinal waves Waves in which the particles in that wave move back and forth/parallel
What is a crest Highest point of transverse wave (top part)
What is a trough Low point of transverse wave
Surface wave When a transverse wave and longitudinal wave combine
Difference between transverse and longitudinal waves These waves are different because the particles move/vibrate in different directions. Transverse= Vibrate in a perpendicular motion longitudinal= back and forth/parallel motion
wave speed formula V = y x f Y is upside down
wavelength formula Y = v/f Y is upside down
frequency formula F= v/y Y is upside down
Reflection When a wave bounces back off a barrier
Example of reflection Mirror reflections, echo
Refraction The bending of a wave as the wave passes from one medium to another at an angle
Diffraction Bending of wave around a barrier or through an opening
Example of diffraction Sound bends around objects.
Interference Result of 2 or more waves overlapping in the same space
2 types of interference Constructive & destructive
Constructive interference Increases the amplitude
Destructive interference Decreases or cancels the amplitude
Standing waves Looks like loops standing still (one wave overlapping another)
Resonance example of music Your body resonants with the music at the same frequency.
Created by: THEG