890627
Questão 1
Questão
Which of these scientists were credited with discovering radioactivity?
Responda
-
Becquerel
-
Sievert
-
Gray
-
Curie
Questão 2
Questão
True or false? All nuclei, both stable and unstable, undergo radioactive decay.
Responda
- True
- False
Questão 3
Questão
True or false? Radioactive decay is a random process roughly following a Poisson distribution.
Responda
- True
- False
Questão 4
Questão
Which five of these are major (contribute to 10% or more) causes of background radiation?
Responda
-
Medical uses (e.g. X-rays)
-
Nuclear power stations
-
Radon gas in the air
-
Radioactivity in the ground
-
Nuclear weapons testing
-
Cosmic radiation
-
Food and drink
-
Air travel
Questão 5
Questão
Which of these scientists helped to discover the nucleus?
Responda
-
Rutherford
-
Geiger
-
Marsden
-
Einstein
-
Lavoisier
-
Mendeleev
Questão 6
Questão
Which of these conclusions were made about the structure of the atom were made following Geiger and Marsden's alpha particle scattering experiment?
Responda
-
The atom is mostly made of matter
-
The atom is mostly made of empty space
-
Most of the mass is concentrated in the nucleus
-
The mass is evenly distributed throughout the atom
-
The nucleus has a large positive charge
-
The nucleus has a large negative charge
Questão 7
Questão
True or false? The previous model for the structure of the atom was known as the "pease pottage" model.
Responda
- True
- False
Questão 8
Questão
How many neutrons can be found in the isotope polonium-210? (Z of Po = 84)
Responda
-
210
-
84
-
126
Questão 9
Questão
Which of these statements are true about alpha particles?
Responda
-
Nucleus loses 2 protons and 2 neutrons
-
A neutron in the nucleus is changed into a proton and an electron
-
A helium nucleus is emitted
-
A high-energy electron is emitted
Questão 10
Questão
Which of these statements are true about beta particles?
Responda
-
Nucleus loses 2 protons and 2 neutrons
-
A neutron in the nucleus is changed into a proton and an electron
-
A helium nucleus is emitted
-
A high-energy electron is emitted
Questão 11
Questão
What is the decay product of thorium-228 if it undergoes alpha decay? (Z of Th = 90)
Responda
-
Thorium-224
-
Radium-228
-
Radium-224
-
Protactinium-228
-
Thorium-228
-
Protactinium-224
Questão 12
Questão
What is the decay product of potassium-40 if it undergoes beta decay? (Z of K = 19)
Responda
-
Potassium-40
-
Potassium-36
-
Chlorine-40
-
Chlorine-36
-
Calcium-40
-
Calcium-36
Questão 13
Questão
Which of these statements are true about alpha radiation?
Responda
-
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
Questão 14
Questão
Which of these statements are true about beta radiation?
Responda
-
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
Questão 15
Questão
Which of these statements are true about gamma radiation?
Responda
-
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
Questão 16
Questão
True or false? The half-life of a radioactive sample is the time taken for the number of parent nuclei to halve.
Responda
- True
- False
Questão 17
Questão
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?
Responda
-
50g
-
25g
-
12.5g
-
6.25g
-
3.125g
-
1.5625g
-
0.78125g
-
0.390625g
Questão 18
Questão
Which of these is a use of alpha radiation?
Responda
-
Carbon and uranium dating
-
Smoke alarms
-
Medical tracers
-
Thickness monitoring
Questão 19
Questão
Which of these is a use of beta radiation?
Responda
-
Carbon and uranium dating
-
Smoke alarms
-
Medical tracers
-
Thickness monitoring
Questão 20
Questão
Which of these is a use of gamma radiation?
Responda
-
Carbon and uranium dating
-
Smoke alarms
-
Medical tracers
-
Thickness monitoring
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