A level physics Revision

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9 Terms

1
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Refraction

Occurs when a wave passes from one medium to another, involves a change in speed and usually a change in direction.

2
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Diffraction

Occurs when a wave goes through a gap or passes boundary, the wave spreads out as it passes the gap due to huygens principle.

3
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huygens principle

A theory saying every point on a wavefront is a source of new circular waves propagating in every direction.

4
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Reflection

Change in direction of wave but does not involve changing medium.

5
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Transverse wave

A wave that has oscillations perpendicular to direction of travel like mechanical wave on a string or light.

6
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Longitudinal

Wave that has oscillations parallel to direction of travel like sound.

7
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Plane Polarised light

Light oscillates in plane/direction direction only. It has been filtered.

8
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When is there no turning effect on a lever

When counter clockwise and clockwise moments are equal.

9
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What happens if 2 waves with phase difference wavelenght/2 superpose.

they interfere destructively.