Physics - Radioactivity
- Created by: gavwinch121
- Created on: 06-12-14 12:16
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- Physics - Radioactivity
- Neutrons are neutral
- Protons are positive
- Electrons are negative
- atoms have no charge which means that the number of protons is equal to the number of electrons
- the top number is the mass number (nucleon number)
- tells us the total of the protons and neutrons in the nucleus
- number of neutrons=mass number-atomic number
- the bottom number is the atomic number (proton number)
- tells us the number of protons and the equal amount of electrons
- number of neutrons=mass number-atomic number
- the electrons orbit the nucleus
- the electrons are lighter than all the others
- the electrons have a - charge
- protons are particles with a + charge
- Physics - Radioactivity
- Neutrons are neutral
- Protons are positive
- Electrons are negative
- atoms have no charge which means that the number of protons is equal to the number of electrons
- the top number is the mass number (nucleon number)
- tells us the total of the protons and neutrons in the nucleus
- the bottom number is the atomic number (proton number)
- tells us the number of protons and the equal amount of electrons
- the electrons orbit the nucleus
- the electrons are lighter than all the others
- the electrons have a - charge
- Physics - Radioactivity
- neutrons are uncharged
- the nucleus is made up of protons and neutrons
- half life
- the half life is the time taken for the activity of a radioactive substance to be reduced to half its original value
- the half life is the time taken for half the radioactive atoms to disintigrate
- alpha radiation can be stopped by a thin sheet of paper or skin , travels at 10% speed of light, made up of particles f helium neuclei
- beta can be stopped by a few mm of aluminuim, travels at 90% speed of light, made up of fast moving electrons
- gamma can be stopped by several cm of lead or many metres of concrete, no mass , pure energy
- beta can be stopped by a few mm of aluminuim, travels at 90% speed of light, made up of fast moving electrons
- Radiation is detected by a GEIGER COUNTER - gives us a couont rate - can work out the counts per minute ( CPM)
- when radiation is emitted from an atom the nucleus inside disintigrates
- gamma travel at the speed of light
- gamma can travel through a vacuum
- beta has a negative charge
- gamma can travel through a vacuum
- gamma travel at the speed of light
- radioactive decau is the breaking up of unstable nuclei
- background radiation can be deteted by using a geiger muller tube
- radioactive decay is completely random
- these particles are not affected by magnetic or electric fields
- radioactive decay is completely random
- background radiation can be deteted by using a geiger muller tube
- background radiation can be deteted by using a geiger muller tube
- radioactive decay is completely random
- these particles are not affected by magnetic or electric fields
- radioactive decay is completely random
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