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16 Cards in this Set
- Front
- Back
Q
What is reflection? |
A
When an object or wave hits a surface through which it cannot pass, it bounces back. |
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Q
What is the angle of incidence? |
A
The angle between the reflected wave and the imaginary perpendicular line. |
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Q
What is the angle of reflection? |
A
The angle between the relected wave and the imaginary perpendicular line. |
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Q
What is refraction? |
A
The bending of waves as they change speed when moving from one medium to another. |
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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. |
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Q
What 2 conditions cause diffraction of a wave? |
A
1. going through a hole in a barrier 2. going around a barrier |
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Q
What is interference? |
A
The effect 2 or more waves have on each other when they meet. |
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Q
Name the 2 types of interference. |
A
1. constructive interference 2. destructive interference |
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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. |
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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. |
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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. |
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Q
What is a node? |
A
The stationary points on the rope (medium) where destructive interference cancels out both waves. |
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Q
What are the antinodes? |
A
The crests and troughs of a standing wave. They are points of maximum energy. |
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Q
When does resonance happen? |
A
When the vibration (wave) passing through an object (medium) matches the object's natural frequency. |
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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. |
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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. |