Pregunta 1
Pregunta
Which of these scientists were credited with discovering radioactivity?
Respuesta
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Becquerel
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Sievert
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Gray
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Curie
Pregunta 2
Pregunta
True or false? All nuclei, both stable and unstable, undergo radioactive decay.
Pregunta 3
Pregunta
True or false? Radioactive decay is a random process roughly following a Poisson distribution.
Pregunta 4
Pregunta
Which five of these are major (contribute to 10% or more) causes of background radiation?
Pregunta 5
Pregunta
Which of these scientists helped to discover the nucleus?
Respuesta
-
Rutherford
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Geiger
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Marsden
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Einstein
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Lavoisier
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Mendeleev
Pregunta 6
Pregunta
Which of these conclusions were made about the structure of the atom were made following Geiger and Marsden's alpha particle scattering experiment?
Respuesta
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The atom is mostly made of matter
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The atom is mostly made of empty space
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Most of the mass is concentrated in the nucleus
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The mass is evenly distributed throughout the atom
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The nucleus has a large positive charge
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The nucleus has a large negative charge
Pregunta 7
Pregunta
True or false? The previous model for the structure of the atom was known as the "pease pottage" model.
Pregunta 8
Pregunta
How many neutrons can be found in the isotope polonium-210? (Z of Po = 84)
Pregunta 9
Pregunta
Which of these statements are true about alpha particles?
Respuesta
-
Nucleus loses 2 protons and 2 neutrons
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A neutron in the nucleus is changed into a proton and an electron
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A helium nucleus is emitted
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A high-energy electron is emitted
Pregunta 10
Pregunta
Which of these statements are true about beta particles?
Respuesta
-
Nucleus loses 2 protons and 2 neutrons
-
A neutron in the nucleus is changed into a proton and an electron
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A helium nucleus is emitted
-
A high-energy electron is emitted
Pregunta 11
Pregunta
What is the decay product of thorium-228 if it undergoes alpha decay? (Z of Th = 90)
Respuesta
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Thorium-224
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Radium-228
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Radium-224
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Protactinium-228
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Thorium-228
-
Protactinium-224
Pregunta 12
Pregunta
What is the decay product of potassium-40 if it undergoes beta decay? (Z of K = 19)
Respuesta
-
Potassium-40
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Potassium-36
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Chlorine-40
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Chlorine-36
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Calcium-40
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Calcium-36
Pregunta 13
Pregunta
Which of these statements are true about alpha radiation?
Respuesta
-
Very penetrating - stopped by several cm of lead
-
Fairly penetrating - stopped by several mm of aluminium
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Poorly penetrating - stopped by a sheet of paper
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Very ionising
-
Fairly ionising
-
Poorly ionising
-
Deflected by a large angle to the positive region of a field
-
Deflected by a small angle to the negative region of a field
-
Not deflected in a field
Pregunta 14
Pregunta
Which of these statements are true about beta radiation?
Respuesta
-
Very penetrating - stopped by several cm of lead
-
Fairly penetrating - stopped by several mm of aluminium
-
Poorly penetrating - stopped by a sheet of paper
-
Very ionising
-
Fairly ionising
-
Poorly ionising
-
Deflected by a large angle to the positive region of a field
-
Deflected by a small angle to the negative region of a field
-
Not deflected in a field
Pregunta 15
Pregunta
Which of these statements are true about gamma radiation?
Respuesta
-
Very penetrating - stopped by several cm of lead
-
Fairly penetrating - stopped by several mm of aluminium
-
Poorly penetrating - stopped by a sheet of paper
-
Very ionising
-
Fairly ionising
-
Poorly ionising
-
Deflected by a large angle to the positive region of a field
-
Deflected by a small angle to the negative region of a field
-
Not deflected in a field
Pregunta 16
Pregunta
True or false? The half-life of a radioactive sample is the time taken for the number of parent nuclei to halve.
Pregunta 17
Pregunta
What would be the mass of a radioactive sample after 2 and a half hours if its original mass were 100g and its half-life were half an hour?
Respuesta
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50g
-
25g
-
12.5g
-
6.25g
-
3.125g
-
1.5625g
-
0.78125g
-
0.390625g
Pregunta 18
Pregunta
Which of these is a use of alpha radiation?
Pregunta 19
Pregunta
Which of these is a use of beta radiation?
Pregunta 20
Pregunta
Which of these is a use of gamma radiation?