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P6 (Waves, Refraction, Dangers of EM Waves, Transverse Waves, Longitudinal…
P6
Waves
When waves travel through a medium, they transfer energy (Not matter)
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Refraction
Refraction - when a waves changes direction as it crosses a boundary between two materials at an angle to the normal
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Dangers of EM Waves
Radiation Dose - Measure of the risk of harm to body tissues due to the exposure to radiation. It is measures in sieverts.
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Transverse Waves
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- Ripples in water
- Electromagnetic waves
- Waves on a string
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Uses of EM Waves
- Radio Waves - TV, Radio
- Microwave - Satellite coms, Cooking
- Infrared - Electric heaters, Cooking, Infrared cameras
- Visible Light - Coms through optic fibres
- UV Waves - Energy efficient lights, Sun tan beds
- X-Rays - Medical imaging, medical treatments.
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