Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
revision
AQA P1b revision notes
| Keyword | Definition |
|---|---|
| What is the order of the Elecromagnetic Spectrum (increasing in wavelength)? | gamma, xrays, UV, visible, Infrared, microwaves, radiowaves |
| At what speed do all EM waves travel? | speed of light |
| How do you calculate wave speed? | Wave speed = frequency x wavelength |
| Frequency is... | Number of waves passing a point each second |
| Microwaves can be used for... | Mobile telecommunications via satellites |
| Toasters, ordinary lightbulbs and TV remotes give out what type of radiation? | Infra-red |
| IR and visible light rays can be used in communications - through what type of fibre? | Optical (fibre optical cables) |
| This type of signal continuously varies... | Analogue |
| This type of signal is a series of 'ons' and 'offs'... | Digital |
| Noise is more easily removed from which type of signal? usually called sampling. | Digital |
| What type of radiation damages skin and eyes? | UV |
| Shadow pictures of bones are produced by... | Xrays |
| What can gamma rays be used for? | sterilising surgical instruments and preserving fruit. |
| What 2 particles are contained in the nucleus of an atom? | Protons and neutrons |
| What is ionisation? | When an atom loses or gains an electron |
| What is an isotope? | An atom with the same number of protons but a different number of neutrons |
| Name as many alpha radiation properties as you can... | High ionising potential, low penetrating power (stopped by few cm air/paper), He nucleus, used in smoke detectors, has positive charge |
| Name as many beta radiation properties as you can... | Stopped by thin aluminium, negatively charged, high speed electron, used in tracers and to control thickness of paper/foil/plastic |
| Name as many gamma radiation properties as you can... | No charge, very penetrating (stopped by thick concrete/lead), used in sterelising medical instruments, not ionising, is an EM wave |
| What is half life? | Time for half the atoms to decay and time for radiation to reduce to half its original value |
| How do health workers reduce their exposure to radiation? | Wear lead lined aprons and photographic film badges which measure the exposure. |
| What is our galaxy called? | The milky way |
| What is our star called in our solar system? | The Sun |
| What theories do you know of the origin of the universe? | Creation theory/belief, big bang theory |
| What evidence is there for the big bang theory? | Red shift |
| What does red shift suggest? | Universe is expanding/evidence for the big bang theory |
| What type of EM wave do optical telescopes use? | Visible light |
| What type of telescope is Hubble? | Optical space telescope |
| What are the advantages of having a telescope outside of the Earths atmosphere? | No distortion of light by weather |
| What type of EM waves can radiotelescopes use? | radio, UV, Xrays |
Created by:
sandringham
Popular Nursing sets