12940728
Descripción
Test por Robyn Stevenson, actualizado hace más de 1 año
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Creado por Robyn Stevenson
hace más de 6 años
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Pregunta 1
Pregunta
The radius of an atom is 1 x 10(-10) and the nucleus is about 1/10000 of this
Respuesta
- True
- False
Pregunta 2
Pregunta
Electrons can change energy levels when an atom [blank_start]absorbs[blank_end] electromagnetic radiation so the electrons moves from a [blank_start]lower[blank_end] energy level to a [blank_start]higher[blank_end] on. If the atom [blank_start]emits[blank_end] electromagnetic radiation so the electron returns to its [blank_start]original[blank_end] energy level
Respuesta
-
higher
-
original
-
lower
-
absorbs
-
emits
Pregunta 3
Pregunta
What does the mass number represent?
Respuesta
-
Protons and Neutrons
-
Protons and Electrons
-
Neutrons
-
Electrons
-
Protons
Pregunta 4
Pregunta
Isotopes are the same element but with a different number of [blank_start]neutrons [blank_end]
Respuesta
-
neutrons
Pregunta 5
Pregunta
Ancient Greeks->1897->Plum pudding model->Alpha scattering experiment->Nuclear model->Niels Bohr->James Chadwick
Respuesta
- True
- False
Pregunta 6
Pregunta
Some isotopes have an [blank_start]unstable[blank_end] nucleus so to become [blank_start]stable[blank_end] the nucleus gives out [blank_start]radiation[blank_end] - radioactive decay ( a [blank_start]random[blank_end] process)
Respuesta
-
unstable
-
stable
-
radiation
-
random
Pregunta 7
Pregunta
The rate at which a source of [blank_start]unstable[blank_end] nuclei [blank_start]decay[blank_end]. Which is measured using a [blank_start]Geiger[blank_end]-muller tube.
Respuesta
-
unstable
-
decay
-
Geiger
Pregunta 8
Pregunta
Alpha particles—>
Respuesta
-
2 protons + 2 neutrons
-
An electrons which is ejected form the nucleus at a very high speed and formed in the nucleus when a neutron changes into a proton and an electron
-
A type of electromagnetic radiation from the nucleus
-
A neutron
Pregunta 9
Pregunta
Beta particle—>
Respuesta
-
2 protons + 2 neutrons
-
An electron which is ejected from the nucleus at a very high speed. Formed inside the nucleus when a neutron changes into a proton and an electron
-
A type of electromagnetic radiation from the nucleus
-
A neutron
Pregunta 10
Pregunta
Gamma radiation—>
Respuesta
-
2 protons + 2 nucleus
-
An electron which is ejected from the nucleus at a very high speed. Formed inside the nucleus when a neutron changes into a proton and an electron.
-
A type of electromagnetic radiation from the nucleus
-
Neutron
Pregunta 11
Pregunta
Nuclear equations- alpha decay, atomic number decreases by [blank_start]2[blank_end] and the mass number by [blank_start]4[blank_end]
Respuesta
-
2
-
4
-
1
-
4
-
6
-
1
-
2
Pregunta 12
Pregunta
Nuclear equations- Beta decay, the atomic number [blank_start]increases[blank_end] by [blank_start]1[blank_end] and the [blank_start]mass[blank_end] number doesn’t change
Respuesta
-
increases
-
decreases
-
1
-
2
-
4
-
mass
-
atomic
Pregunta 13
Pregunta
Half life- the time it takes for the count rate or activity (number of decay per second) from a sample contains the isotope to fall to half its initial level.
Respuesta
- True
- False
Pregunta 14
Pregunta
Radiation cannot be ionising (form charge ions)
Respuesta
- True
- False
Pregunta 15
Pregunta
[blank_start]Irradiation[blank_end] is exposing an object to nuclear radiation like [blank_start]sterilisation[blank_end] which uses [blank_start]gamma[blank_end] radiation.
Respuesta
-
Irradiation
-
sterilisation
-
gamma
Pregunta 16
Pregunta
Ionising radiation decreases the risk of cancer
Respuesta
- True
- False
Pregunta 17
Pregunta
Precautions when using ionising radiation include...
Respuesta
-
Shielding- gloves can protect against alpha radiation and beta and gamma radiation can be reduced a lead apron.
-
Monitoring
-
Exposure
Pregunta 18
Pregunta
Alpha radiation is [blank_start]strongly[blank_end] ionising. It can be stopped by dead skin cells and alpha emitters can be dangerous if inhaled or swallowed.
Respuesta
-
strongly
-
less
-
weakly
Pregunta 19
Pregunta
Beta radiation is [blank_start]less[blank_end] ionising. It can penetrate skin.
Respuesta
-
less
-
strongly
-
weakly
Pregunta 20
Pregunta
Gamma radiation is [blank_start]weakly[blank_end] ionising. Can penetrate the body but likely to pass through.
Respuesta
-
weakly
-
less
-
strongly
Pregunta 21
Pregunta
A tracer must...
Respuesta
-
Pass out of the body and be detected (gamma or beta)
-
Not be strongly ionising to minimise damage to body tissue (gamma)
-
Not decay into another radioactive isotope
-
Have a short half life so it is not present in the body for too long
Pregunta 22
Pregunta
Gamma rays through radiotherapy can pass into the body and destroy a tumour
Respuesta
- True
- False
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