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26 Cards in this Set
- Front
- Back
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What are antinodes? |
The point on a stationary wave where the displacement of particles varies by the maximum amount |
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What is the fundamental mode of vibration? |
In the fundamental mode of vibration the length of the string is half the wavelength. This produces the lowest possible frequency called the first harmonic |
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The number of harmonic equals the number of what? |
Antinodes Second harmonic has two antinodes |
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What are transverse waves |
Transverse waves oscillates perpendicular to the propagation |
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What are longlitudinal waves? |
Longlitudinal waves oscillates parallel to the propogation |
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What type of wave can be polarised? |
Transverse waves |
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Define polarisation |
The transmition of vibration or waves in one plane (direction) |
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What's a polarisation filter? |
An apparatus that allows waves to occur in one plane only. Made of crystalline material that absorb light. |
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What's the difference between a progressive wave and stationary wave? |
A Stationary wave stores energy A progressive wave transfers energy |
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Define displacement |
The distance any part of the wave has moved from its mean or rest position |
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Define period |
The time taken for one complete pattern of oscillation to take place at any point |
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How are stationary waves produced |
Stationary waves are produced by interference in accordance with principle of superposition |
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What's the principle of superposition |
States that the resultant displacment of two or more waves is equal to the vector sum of the waves displacement at that point |
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In order for a stationary wave to be produced what must there be? |
-two waves that overlap must be travelling in the opposite direction - Have the same frequency - Have approximately equal amplitude |
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Define path difference |
Which we refer to in relation to the wavelength is the differences between the distance travelled by two waves arriving at the same point |
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What equation do we use to find out frequency? |
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What equation do we use to find out the velocity of a wave? |
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What are nodes? |
Nodes are the point on a stationary wave at which there is no displacement |
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Define phase difference |
The relationship between the pattern of vibration at two points. Two points that have exactly the same pattern of oscillation are said to be in phase |
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What is the equation for the refractive index? |
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Define diffraction |
Its the spreading out of a wave after passing around an obstacle or gap |
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Define interference |
The addition of two or more waves (superposition) that results in a new wave pattern |
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Define refraction |
Refraction occurs when light enters a different optical density, this causes a change in speed, this may cause a change in direction |
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What's young doubles equation? |
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Define monochromatic light? |
Light wave with a single frequency or wavelength |
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Define coherence |
Two waves with a constant phase relationship |
