Fichas
atomic structure (phsyics)
Fichas del conjunto (19)
- 1what is an isotopean element with same amount of protons and different amount of neutrons
- 2what is an ionwhen an element gains(-) or loses(+) an electron
- 3mass of a proton,neutron,electron1,1,very small
- 4what is a half lifethe time it takes for radioactive matter to decay by half
- 5explain nuclear fissionneutron hits an unstable nuclei, releases energy, two daughter nuclei, thee/two neutrons, gamma rays
- 6alpha radiationhighly ionising,low penetration,range in air is a few cm, can be stopped by a sheet of paper
- 7beta radiationmoderately ionizing and pentrating, can be stopped by a thin sheet of aluminium
- 8gamma radiationa wave, highly penetration,low ionising,can be stopped by a thick sheet of led or concrete
- 9what is irradiationexposing objects to radiation
- 10what is contaminationunwanted radioactive atoms on other material
- 11explain a nuclear reactorneutron hit rods
split into 2 nuclei,energy&neutron
heats water
water ---> steam
steam works generator - 12what goes on in a nuclear reactorfuel rods-release energy via fission
control rod-if too much fission,absorb neutron
moderator-water/graphite slow neutron down
sheilding-stops radiation escaping - 13what does lowering control rods do?increases no. neutrons absorbed-- slower rate of reaction, decrease energy released
- 14what did rutherfords alpha scattering test prove-the mass was concentrated in one area of the atom(nucleus)
-a positive charge was conc in one area of the atom(proton) - 15who discovered the neutron?James Chadwick
- 16who discovered the electron?JJ Thompson
- 17describe the plum pudding modela ball of positive charge with negativelty charged electrons distributed within it
- 18why is beta used to measure thickness of paperit is moderatively penetrating so if more beta is detected the paper is too thin and if less is detected it's too thick
- 19why is alpha radiation used in a smoke detectorAlpha radiation in smoke detectors ionizes air, creating a current. Smoke disrupts this, triggering an alarm. Efficient, low penetration, and minimal harm.
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- GCSE (atomic structure) Physics Fichas sobre atomic structure (phsyics), creado por khadija eyitayo el 21/01/2024.
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- khadija eyitayo
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