All waves are a series of oscillations that transfer energy from one place to another. Water waves are oscillations of water particles. Electromagnetic waves are oscillations of electric and magnetic fields.
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Displacement
The size of the oscillation at a particular time and place.
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Wavelength
Is the distance between two identical points on adjacent waves.
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Amplitude
Is the maximum displacement caused by the wave.
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Speed
Is how fast the disturbance moves, measured in metres per second (m/s)
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Period
Is the time taken for one whole cycle of the wave to complete
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Frequency
Is the number of waves that pass in each second, measured in hertz (Hz)
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Longitudinal wave
shows oscillations parallel to the direction of motion of the wave, if the wave is moving from right to left the oscillation would be left to right.
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Transverse wave
shows oscillation at right angles to the direction of motion, if oscillations was up and down the wave could be moving from left to right.
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What wave can be polarised?
Transverse waves.
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Polarised wave
Has oscillations in one direction only. A wave travelling from left to right could be polarised so oscillations were ONLY left-to-right and ONLY up-and-down
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Nodes
nodes are points where there is NO oscillation
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Antinodes
Antinodes are places where oscillation is greatest.
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What is in the electromagnetic spectrum?
radiowaves, microwaves, infrared, visible light, ultraviolet, X-rays and Gamma rays
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what wave in the electromagnetic spectrum has the highest frequency?
Gamma rays
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what wave in the electromagnetic spectrum has the lowest frequency?
radiowaves
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what wave in the electromagnetic spectrum has the shortest wavelength?
gamma rays
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what wave in the electromagnetic spectrum has the longest wavelength?
radiowaves
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Are the waves in the electromagnetic spectrum Transverse or longitudinal?
Transverse
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What are the dangers of radiowaves?
There are no known dangers
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What are the dangers of microwaves?
Internal heating of body tissue. No firm evidence that it can cause cancer
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What are the dangers of infrared?
High intensity infrared can cause skin burns
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What are the dangers of visible light?
High intensity can cause eye damage
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What are the dangers of ultraviolet?
If absorbed by eyes or skin it can cause skin cancer or eye conditions
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What are the dangers of X-rays?
Absorbed deep inside the body, can mutate/ damage DNA, kills cells and cause cancer
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What are the dangers of gamma rays?
Absorbed deep inside the body, can mutate/ damage DNA, kills cells and cause cancer
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Other cards in this set
Card 2
Front
The size of the oscillation at a particular time and place.
Back
Displacement
Card 3
Front
Is the distance between two identical points on adjacent waves.
Back
Card 4
Front
Is the maximum displacement caused by the wave.
Back
Card 5
Front
Is how fast the disturbance moves, measured in metres per second (m/s)
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