Flashcards
physics radio active decay
Flashcards do conjunto (17)
- 1what is radio active decayunstable nucleus of an atom gives out radiation and become amore stable
- 2what is an isotopean atom of an element with a different number of neutrons
- 3what is an iona charged particle
- 4whats an alpha particleit has helium nucleus , very ionising . stopped by paper charge= positive
- 5whats a beta particlea fast moving particle . ionising . stopped by thin aluminium charge = negative
- 6what is a gamma rayelectromagnetic wave . least ionising . stopped by thick concrete or lead. Charge = no charge
- 7whats count ratecount per second in Bq (bequerels)
- 8whats half lifetime it takes for count rate to fall by half
- 9what does ionising meantuns an atom to an ion
- 10what does electromagnetic radiation domakes the electron jump to a different shell
- 11the electron then amirs this energy and returns to normalphoton is the amount of energy needed to make a electron jump
- 12why do atoms form ionsbecause they don't have a full outer shell so they add or loose electrons to make them ok.
atom loose electron to become positive. cation
or gain electrons to become negative. anion - 13what is the rate of which radioactive decay occurs calledactivity and is measured in becquerels
- 14what tube records the number of decays per second?Geiger muller tube
- 15whats the atomic numberthe small number ( number of protons)
- 16whats the mass numberthe bigger number ( neutrons and protons together)
- 17—
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- physics FlashCards sobre physics radio active decay , criado por hollie gould em 30-11-2017.
- Criado por
- hollie gould
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