Flashcards
The EM spectrum
Cards in this deck (10)
- 1Radio waves:Uses:
- tv, radio, bluetooth
Explanation:
- they're low energy so they're not dangerous (therefore ideal for radio transmission) - 2Microwaves:Uses:
- satellite communications, cooking
Explanation:
- travel in straight lines through atmosphere, ideal for transmitting signals - 3Infrared waves:Uses:
- electric heaters, cooking, infrared camera
Explanation:
- food appliances using infrared glow red as electricity flows through, this transmits infrared energy that is absorbed by the food and converted back into heat - 4Visible light:Uses:
- fibre optic communications
Explanation:
- visible light travels through fibres from one end to the other without being lost through the sides - 5Ultraviolet waves:Uses:
- efficient light bulbs, sunbeds, security marking
- in bulbs, UV waves are [produced through the gas in the bulb, these UV waves are absorbed by the coating of the bulb which gives off light - 6X-rays:Uses:
- medical imaging and treatments
Explanation:
- X-rays penetrate soft tissue but not bone, a photographic plate behind the patient shows shadows where bones are - 7Gamma Rays:Uses:
- sterilising food, treating tumours
Explanation:
- gamma rays are the most energetic of all EM waves and can destroy bacteria and tumours - 8How are radio waves produced and transmitted?- they're caused by oscillations in electrical circuits
- the frequency of a radio wave matches the frequency of the electrical oscillation (this is how they're produced) - 9What can the changes in the nucleus of an atom lead to?Changes in the nucleus can generate waves, i.e an unstable nucleus can give out excess of gamma rays
- 10How can ultraviolet waves, gamma rays and x-rays be hazardous to the human body?- UV waves can cause premature aging of skin and can cause skin cancer
- X-rays and gamma rays are ionising radiation- they can damage cells by ionising toms. Being absorbed by the nucleus of a cell can lead to cell mutations and cancer
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- GCSE Physics (P2 Waves) Flashcards on The EM spectrum, created by Amelia Quinn on 24/02/2018.
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- Amelia Quinn
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