7 Parts Of A Wave CREST AMPLITUDE WAVELENGTH TROUGH high point of a transverse waveAMPLITUDEhalf the distance between the crest and troughWAVELENGTHTROUGHdistance from top of one crest to the top of the next OR from one trough to the nextlow point of a transverse wave
8 Properties of wavesAmplitude – tells how much ENERGY the wave is carryingBright light has higher amplitude than dimLoud sounds have higher amplitude than softLarge water waves carry more energy than small ones
9 Properties of waves Red has a longer & Violet has a shorter Wavelength (λ)–In visible light, λ determines colorλλRed has a longer& Violet has a shorterλRadio waves and microwaves have longerλX-rays and gamma ray have shorter
10 Properties of wavesFrequency – the number of λ that pass a given point in one second, measured in λ/sec = hertzHigher frequency indicates faster vibration of whatever is generating the wave
11 Properties of waves CLICK HERE > F = < λ Frequency and wavelength are closely relatedShort λ creates a higher frequencyIn sound, this causes a higher pitchIn light, violet color has a higher frequency than redLong λ creates a lower frequencyIn sound, this causes a lower pitchIn light, red color has a lower frequency than violetCLICKHERE> F = < λ
12 Properties of waves WAVE SPEED Mechanical Wave Travels faster through solids because molecules are closer together and transmit the sound betterElectromagnetic WaveTravels faster through empty space because there are no molecules in the way to slow it down
13 When sound waves reflect from a surface, it produces an ECHO. Wave BehaviorReflection: a wave strikes a surface and bounces offHELLOOOO!!!HELLOOOO!!!Reflection are clear when they bounce off a smooth, even surface. From a rough surface, light scatters in all directions and the reflection is distorted.When sound waves reflect from a surface, it produces an ECHO.
14 Wave BehaviorRefraction: The bending of a wave as it moves from one medium into another because of a change in SPEED.
15 Diffraction occurs better when the barrier and λ are similar in size. Wave BehaviorDiffraction: The bending of waves around a barrier.LIGHT WAVESLight waves do not diffract as much as sound waves, so you can’t see around corners.This is because the λ of light is so much smaller than the width of a door.Diffraction occurs better when the barrier and λ are similar in size.SOUND WAVESYou can hear sounds from a room even when you are not in the room because the sound waves bend as they pass through the open doorwayWATER WAVESWhen water waves strike obstacles such as islands, they bend around the island and keep moving. If the island was much bigger than than the wavelength of the water wave, less diffraction would occur
16 Wave BehaviorInterference: The ability of two waves to combine and form a new wave when they overlap