Warm Up 1. How are longitudinal wavelengths measured?

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Presentation transcript:

Warm Up 1. How are longitudinal wavelengths measured? 2. How do you find the frequency of a wave? 3. Wave speed depends on the ____________. 4. What type of objects do wave travel fast in? How about slow?

Chapter 14-2, 14-3 Wave Interactions

Doppler Effect: Pitch is determined by frequency Pitch – High or low the sound is Frequency changes when the source of the wave is moving

Doppler Effect Doppler Effect – Change in the frequency (pitch) of a wave when the source or the observer is moving

Reflection Reflection - a wave strikes an object and bounces off of it All waves: Light Sound Water

Wave Interactions: Reflection – Bouncing back of a wave (Sound, Light, or Heat) Waves bend around an edge

Echoes Sound waves bouncing back (or reflecting) towards you. Yelling in a cave!

The Law of Reflection Incident beam – light beam that strikes the mirror Reflected beam – light beam that bounces off the mirror

The Law of Reflection Normal – line perpendicular to surface of the mirror Angle of incidence = Angle of refection

Refraction As light changes mediums – it changes speed Refraction - bending of a wave caused by a change in its speed as it moves from one medium to another

Wave Interaction: Different substances have different wave speeds

Refraction

Refraction

Diffraction Diffraction - causes a wave to change direction and bend around it. Waves pass around an object.

Wave Diffraction

Diffraction of Radio Waves AM radio waves - longer wavelengths FM radio waves – shorter wavelength AM gets better reception

Interference Interference - Two or more waves overlap and combine to form a new wave

Constructive Interference Waves add together Crests of two or more transverse waves arrive at the same place at the same time and overlap

Constructive Interference Amplitude = sum of 2 waves

Destructive Interference Destructive interference - waves subtract from each other as they overlap

Standing Waves Standing waves – a wave pattern of vibration that simulates a wave that is standing still

Nodes and Anti-Nodes

Standing Waves: A pattern of vibration that simulates a wave that is standing still Nodes – Point that separates the loops in a standing wave and has no vibration – Complete Destructive Interference Antinodes – Points of maximum vibration – Complete Constructive Interference

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