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### 16 Cards in this Set

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 Q What is reflection? A When an object or wave hits a surface through which it cannot pass, it bounces back. Q What is the angle of incidence? A The angle between the reflected wave and the imaginary perpendicular line. Q What is the angle of reflection? A The angle between the relected wave and the imaginary perpendicular line. Q What is refraction? A The bending of waves as they change speed when moving from one medium to another. Q What is diffraction? A The bending and spreading out of a wave as it passes a barrier or moves through a hole in a barrier. Q What 2 conditions cause diffraction of a wave? A 1. going through a hole in a barrier 2. going around a barrier Q What is interference? A The effect 2 or more waves have on each other when they meet. Q Name the 2 types of interference. A 1. constructive interference 2. destructive interference Q What happens in constructive interference? A Two waves combine to make a wave with a larger amplitude. The waves combine energy and get stronger. Q What happens in destructive interference? A Two waves combine to make a wave with a smaller amplitude. The waves cancel each others energy producing a weaker wave or no wave at all. Q What is a standing wave? A A wave that appears to be standing still but is really 2 waves interfering as they pass through each other. Q What is a node? A The stationary points on the rope (medium) where destructive interference cancels out both waves. Q What are the antinodes? A The crests and troughs of a standing wave. They are points of maximum energy. Q When does resonance happen? A When the vibration (wave) passing through an object (medium) matches the object's natural frequency. Q What happens during resonance? A The amplitude of the object's vibrations (wave) increases. The medium begings to vibrate or its vabrations (waves) get stronger. Q What is the danger caused by resonance to inflexible objects like bridges? A The resonance can cause them to shatter. The vibration of troops marching across a bridge can cause it to collapse.