Flashcards
Physics P1.1 B
Flashcards do conjunto (26)
- 1What is the electromagnetic spectrum?The 'family' of electromagnetic radiation of different frequencies & wavelengths.
- 2What is electromagnetic radiation?A radiation that consists of vibrating electric & magnetic fields.
- 3what are the main groups of magnetic radiation?Gamma, X-rays, UV, Visible Light, Infrared, Microwave, & Radio.
- 4What are uses & effects of Gamma Rays?+ Causes cancer & can kill cancer cells
+ Used for sterilising medical equipment & food - 5what are uses & effects of X-rays?+ Used for X-ray photography
+ Causes fluorescence
+ Causes cancer & can kill cancer cells - 6What are uses & effects of UV?+ Causes tanning, skin cancer, & eye damage
+ Causes fluorescence
+ Kills bacteria - 7What is special about visible light?Only type of radiation visible to the human eye.
- 8What are some examples & effects of Infrared?+ Radiant heaters & grills
+ TV & video remote controllers
+ Security alarms & lamps
+ Carries digital signals in fibre optic broadband cables - 9What are some uses & effects of Microwaves?+ TV & communication satellites
+ Heating effects in Microwave ovens
+ Mobile phones
+ Telephone links; Radar
+ TV broadcasts - 10what are some uses & effects of Radio+ Radio ( FM, AM, Local, Long-distance)
- 11Generally, what happens when electromagnetic radiation is absorbed?Objects gain energy.
- 12What happens when an aerial absorbs microwave & radio?They make patterns carried by them into patterns of electrical current, which are used by Radios & TVs.
- 13How dies radiation cause heating?The vibrations of particles are created & this kinetic energy transfers onto thermal energy.
- 14In what circumstances can radiation increase the chance of chemical reactions?Only if the radiation carries high levels of energy.
- 15what is a molecule?A molecule is a group of 2 or more atoms joined together.
- 16What molecules absorb microwaves?Water, Fat, & Sugar
- 17What happens when molecules of fat, water, & sugar absorb Microwaves?They vibrate strongly ( temperature rises )
- 18What are some safety features of Microwave ovens?Metal grids on doors that reflect radiation back, & a hidden switch that prevents the oven from working w/ door open.
- 19What does the heating effect depend on?The type of radiation, the intensity, & the duration.
- 20How can the nuclear model describe ionisation?When an atom absorbs a photon , it gains energy & 1 electron moves further from the nucleus. the atom looses its extra energy by emitting a photon of electromagnetic radiation.
- 21What charge is the atom after ionisation & what is it called?Positive
Ion - 22what are the ionising radiations?Gamma, X-rays, & some UV.
- 23Why are some radiations called ionising?Because a single photon has enough energy to ionise an atom or molecule.
- 24what happens if ionisation happens in a living cell?Its chemical reactions might be changed. This can damage it by changing its behaviour.
- 25What happens if a large amount of ionisation of heating happens in a living cell?It can die.
- 26what is the main effect of non-ionising radiation?Heating
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- GCSE Physics (P1 Radiation & waves) FlashCards sobre Physics P1.1 B, criado por lily bevan em 27-11-2017.
- Criado por
- lily bevan
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