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Edexcel new P2
Waves and the em spectrum
| Question | Answer |
|---|---|
| alpha particle | A type of ionising radiation emitted from a radioactive atom |
| amplitude | the maximum distance of particles in a wave from their normal position |
| beta particle | A type of ionising radiation emitted from a radioactive atom |
| cataracts | when the lens in the eye becomes cloudy. Can be caused by too much UV light |
| electromagnetic radiation | a form of energy transfer including radio, microwave, infrared, visible, ultraviolet, Xrays and Gamma rays |
| Fluoresence | Absorbing one wavelength and re emitting the energy at another wavelength normally visible light |
| Frequency | The number of waves passing a point per second |
| Gamma rays | Highest frequency gamma rays |
| Hertz | The unit for frequency 1 Hz = 1 wave per second |
| Infra-red radiation | Electromagnetic radiation we can feel as heat |
| ion | An atom that has been charged. |
| Ionising radiation | UV, Xrays, Gamma radiation, alpha particle, beta partices can cause atoms to be charged. |
| light waves | Electromagnetic radiation that can be detected by the eye. |
| Longitudinal Waves | Waves formed by particle that vibrate backwards and forwards parallel to the direction of energy transfer |
| Microwaves | A type of electromagnetic radiation used in mobile phone communications and heating water molecules in food. |
| Optic fibre | Glass or plastic strand that can direct light or infra-red radiation. |
| radio waves | Part of the electromagnetic spectrum used for communication. They have very long wavelengths and a low frequency |
| radioactive | A material that gives out alpha, beta or gamma radiation. |
| radiotheraphy | Cancer treatment in which a patient is given gamma radiation to kill cancer treatment. |
| spectrometer | A device that can split up light to show the colours of the spectrum |
| spectrum | The range of colours from red to violet obtained when white light is split up using a prism |
| thermal imaging | Photography that uses a detector of infrared radiation |
| Transverse waves | Waves formed by particle that vibrate at right angles to the direction of energy transfer |
| Ultraviolet radiation | Electromagnetic radiation that has a wavelength shorter than visible light but longer than X rays |
| Wave speed | The distance a wave travels in one second |
| Wavelength | The distance between one crest of a wave and the next. |
| X rays | Waves that are part of the electromagnetic spectrum. They are used for seeing inside the body. |
Created by:
Susan E Casey
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