Karteikarten
physics p1e
Karten in diesem Stapel (28)
- 1when cooking with infrared radiation,which part of the food absorbs the radiation?the surface
- 2what happens to the particles in the food when they absorb the infrared radiation?they gain kinetic energy
- 3how is the thermal energy transferred to the rest of the food when using infrared?through conduction, increase of kinetic energy for particles on the surface, increase the kinetic energy of the particles surrounding them, transferring it to the middle
- 4how does infrared radiation reach the food in an oven?convection currents being formed in the oven
- 5do microwaves or infrared waves have more energy? how you do you know this?infrared waves, because it has a shorter wavelength and so higher frequency which means more energy.
- 6what type of electromagnetic waves are used in mobile communications?microwave
- 7what are the risks of mobile communications?worried about the affect on our bodies because of the fat and water molecules as they absorb the radiation
- 8what advice are we given when using mobile communication?limit the use/ use hands free
- 9why is it more a risk for children to use mobile phones?brains/skulls of children are still developing
- 10what part of the food absorbs the microwave radiation?fat and water molecules about 1cm deep of the food
- 11what happens to the particles in the food when they absorb the microwave radiation?absorb thermal energy, kinetic energy increases
- 12how is the thermal energy transferred to the rest of the food?through conduction/convection
- 13why is there a metal grid in the front of a microwave?prevent the microwaves passing out of the microwave, reflecting the, back in and prevents us absorbing the microwaves
- 14what is needed to send a microwave signal?transmitter and receiver device
- 15why is direct line of sight needed?microwaves cant diffract or bend around obstacles. if something is in the way between the transmitter/receiver, the signal wont be received.
- 16how are microwave transmitters and receivers set up to cater for direct line of sight?really high up, on top of buildings, up in hills and in open spaces
- 17how does poor weather effect microwave signals?reduces quality of signal as it scatters them as they are transmitting
- 18how do tall buildings and mountains effect microwave signals?block signals
- 19what is the range of wavelength for a microwave?1mm-30cm
- 20do microwaves uesd for cooking or communication have longer wavelengths?those used for communications have longer wavelengths, ones used for cooking have shorter wavelengths
- 21which have more energy, microwaves used for cooking or communications and why?ones used for cooking have a shorter wavelength and so higher frequency which means they carry more energy
- 22what happens to microwaves as they pass through the atmosphere and why?refracted as it moves through the atmosphere because of the different densities in the earths atmosphere
- 23what is an atmospheric duct?lower atmosphere having a density which causes some microwaves to refract and follows the earths curve
- 24what happens when two microwave signals overlap?they interfere with each other and that changes the quality of the signal
- 25why do scientists compare their research?:to compare findings
:to see whether their experiment is repeatable
:check their findings
build on each others work - 26what is a peer review?other scientists reviewing your work
- 27what do scientists do to improve confidence in their findings?repeat their findings
compare them with other scientists who may have done the same experiment
see other peoples finding to see if their results are repeatable - 28what is an anomalous result and how do we deal with them?doesn't fit the trend of other results, to deal with them we repeat them or discard them
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- Karteikarten am physics p1e, erstellt von parkermolly20 am 06/06/2015.
- Erstellt von
- parkermolly20 · Jun 2015
- Aktualisiert
- 19 Feb 2016
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