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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.