Flashcards
Radioactivity. AQA Chapter 7 Unfinished
Cards in this deck (10)
- 1What is a radioactive substanceA radioactive substance contains unstable nuclei that become stable by emitting radiation.
- 2The types of radiation given out from a radioactive substanceThere are three main types of radiation substance - alpha (α), beta (β), gamma(γ)
- 3When a radioactive source emits radiation (radioactive decay)Radioactive decay is a random event - you can't predict or influence when it will happen.
- 4The different types of radiation emitted by radioactive sourcesRadioactive sources emit α, β and γ radioation.
- 5How the nuclear model of the atom was establishedThe physicist Ernest Rutherford discovered that alpha and beta radiation is made up of-of different types of particles. He realised that alpha (α) particles could be used to probe the atom. He found that some of the α particles were scattered through large angels.
- 6Why the 'plum pudding' model of the atom was rejectedThe 'plum pudding' model could not explain why some α particles were scattered through large angels.
- 7What conclusions were made about the atom from experimental evidence?An atom has a small positively charged central nucleus where most of the atom's mass is located.
- 8Why the nuclear model was acceptedThe nuclear model of the atom correctly explained why some α particles scattered through large angels.
- 9What an isotope isIsotopes of an element are atoms with the same number of protons but different numbers of neutrons. So they have the same atomic number but different mass numbers.
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- Year 9 Physics Flashcards on Radioactivity. AQA Chapter 7 Unfinished, created by Miles McIntosh on 22/12/2017.
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- Miles McIntosh
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