Flashcards
Electromagnetic Waves, AQA Chapter 13
Cards in this deck (22)
- 1The parts of the electromagnetic spectrumThe electromagnetic spectrum (in order of decreasing wavelength and increasing frequency and energy) is made up of:
•radio waves
•microwaves
•infared radiation
•visible light (red to violet)
•ultraviolet waves
•X-rays and gamma rays - 2The range of wavelengths within the electromagnetic spectrum that the human eye can detectThe human eye can only detect visible light. The wavelength of visible light ranges from about 350 nm to about 650 nm
- 3How energy is transferred by electromagnetic wavesic waves transfer energy from a source to an absorber.
- 4How to calculate the frequency of wavelength of electromagnetic waves.Wave speed, v (m/s) (metres per second, m/s) =
frequency, f (Hz) (hertz, Hz) X
wavelength, λ (m) (metres,m) - 5The nature of white lightWhite light contains all the colours of the visible spectrum
- 6What infared radiation is used forInfrared radiation is used for carrying signals from remote control handsets and inside optical fibres
- 7What microwaves and radio waves are used forMicrowaves are used to carry satellite TV programmes and mobile phone calls. Radio waves are used for radio and TV broadcasting.
- 8What mobile phone radiation isMobile phone radiation is microwave radiation and is also radio waves at near-microwave frequencies.
- 9Why these types of electromagnetic radiation are hazardousDifferent types of electromagnnetic radiation are hazardous in different ways. Microwaves and radio waves can heat the internal parts of people's bodies. Infrared radiation can cause skin burns.
- 10Why radio waves of different frequencies are used for different purposes.Radio waves of different frequencies are used for different purposes because the wavelength (and so the frequency) of waves affects:
•how far they can travel
•how much they spread
•how much information they can carry - 11Which waves are used for satellite TVMicrowaves are used for satellite TV signals.
- 12How to decide whether or not mobile phones are safe to useFurther research is needed to evaluate whether or not mobile phones are safe to use.
- 13What carrier waves areCarrier waves are waves that are used to carry information. They do this by varying their amplitude.
- 14How optical fibres are used in communicationsOptical fibres are very thin transparent fibres that are used to transmit communication signals by light and infrared radiation
- 15The differences between ultraviolet and visible lightUltraviolet waves have a shorter wavelength than visible light and can harm the skin and the eyes.
- 16What X-rays are used forX-rays are used in hospitals to make X-rays images.
- 17What gamma rays are used forGamma rays are used to kill harmful bacteria in food, to sterilise surgical equipment, and to kill cancer cells.
- 18What ionising radiation isIonising radiation makes uncharges atoms become charged
- 19Why ultraviolet waves, X-rays, and gamma rays are dangerousX-rays and gamma rays damage living tissue when they pass through it
- 20What X-rays are used for in hospitalsX-rays are used in hospitals:
•to make images of your internal body parts
•to destroy tumours at or near the body surface - 21Why X-rays are dangerousX-rays are ionising radiation and so can damage living tissue when they pass through it.
- 22What absorbs X-rays when they pass through the bodyX-rays are absorbed more by bones and teeth than by soft tissues.
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- Year 9 Physics Flashcards on Electromagnetic Waves, AQA Chapter 13, created by Miles McIntosh on 29/12/2017.
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- Miles McIntosh
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