3 Wave Information Waves are a travelling form of energy Waves can also carry informationSoundLightMusicelectricity
4 Wave Types Transverse Longitudinal Oscillates perpendicular to the direction of the motion.Examples are water waves and seismicS-wavesOscillate in the same direction/parallel to the direction of movementThey move by expanding and contractingExamples are seismic P-waves and sound
5 Parts of a Wave:Waves have the following parts:CrestTrough
6 What are the 2 different types of waves? How are these 2 types of waves different?
10 Frequency How many times the wave oscillates up and down Measured in Hz (hertz)1 Hz is equal to 1 cycle per secondWater frequency is around HzSound has a frequency range of 20-20,000 Hz
11 Wavelength Series of repeating highs and lows Measured from crest to crest, or trough to trough
12 This is the amount/distance that the wave moves away from equilibrium Amplitude:This is the amount/distance that the wave moves away from equilibrium
13 If the frequency of a wave increases, what do you think will happen to the wavelength? What type of a relationship is this?PositiveNegative
14 Frequency and Wavelength have an inverse or negative relationship Relationships:Frequency and Wavelength have an inverse or negative relationshipAs the frequency of a wave increases, its wavelength decreases ORAs the frequency of a wave decreases, its wavelength increases
15 Calculating the Speed of Waves The speed of a wave is equal to its frequency multiplied by its wavelength.V = ƒ ʎV=velocity/speedʎ = wavelength and ƒ= frequencyThis tells you the speed of the oscillations through the material/medium.
16 Wave Interference:When waves encounter an obstacle or interact with matter, they experience interference.There are 4 types of wave interferenceReflectionRefractionDiffractionAbsorption
18 Refraction:When a wave moves through a medium that slows or bends the wave’s movement it is refractedRefraction of light causes objects to appear bent
19 Diffraction:When a wave bends around objects such as sound bending around corners
20 Absorption:When a wave encounters a medium and seems to disappear.
21 What is the difference between refraction and reflection? What is an example of a wave that is reflected?What is an example of a wave being refracted?
22 Interference Continued Constructive InterferenceDestructive InterferenceWhen 2 waves that are “in phase” with one another collideTheir collision causes an increase in the waves effectWhen 2 waves are “out of phase with one another collideTheir collision causes a decrease or temporary disappearance of the wave