Presentation on theme: "WAVES AND WAVE PROPERTIES. Simulation Wave Information Waves are a travelling form of energy Waves can also carry information Sound Light Music electricity."— Presentation transcript:
WAVES AND WAVE PROPERTIES
Wave Information Waves are a travelling form of energy Waves can also carry information Sound Light Music electricity
Wave Types Transverse Oscillates perpendicular to the direction of the motion. Examples are water waves and seismic S-waves Longitudinal Oscillate in the same direction/parallel to the direction of movement They move by expanding and contracting Examples are seismic P-waves and sound
Parts of a Wave: Waves have the following parts: Crest Trough
What are the 2 different types of waves? How are these 2 types of waves different?
Wave Properties Waves have 3 specific, identifying properties: Frequency Wavelength λ Amplitude
Frequency How many times the wave oscillates up and down Measured in Hz (hertz) 1 Hz is equal to 1 cycle per second Water frequency is around.1-10 Hz Sound has a frequency range of 20-20,000 Hz
Wavelength Series of repeating highs and lows Measured from crest to crest, or trough to trough
Amplitude: This is the amount/distance that the wave moves away from equilibrium
If the frequency of a wave increases, what do you think will happen to the wavelength? What type of a relationship is this? Positive Negative
Relationships: Frequency and Wavelength have an inverse or negative relationship As the frequency of a wave increases, its wavelength decreases OR As the frequency of a wave decreases, its wavelength increases
Calculating the Speed of Waves The speed of a wave is equal to its frequency multiplied by its wavelength. V = ƒ ʎ V=velocity/speed ʎ = wavelength and ƒ= frequency This tells you the speed of the oscillations through the material/medium.
Wave Interference: When waves encounter an obstacle or interact with matter, they experience interference. There are 4 types of wave interference Reflection Refraction Diffraction Absorption
Refraction: When a wave moves through a medium that slows or bends the wave’s movement it is refracted Refraction of light causes objects to appear bent
Diffraction: When a wave bends around objects such as sound bending around corners
Absorption: When a wave encounters a medium and seems to disappear.
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?
Interference Continued Constructive Interference When 2 waves that are “in phase” with one another collide Their collision causes an increase in the waves effect Destructive Interference When 2 waves are “out of phase with one another collide Their collision causes a decrease or temporary disappearance of the wave
HARMONIC MOTION Motion that repeats in cycles A cycle is a unit of motion that repeats over and over Harmonic Motion is different from Linear Motion