Radioactive Substances Quiz Questions
15 Questions
| Attempts: 116
Questions and Answers
- 1.
The nucleus of a particular form of carbon (chemical symbolC) contains 6 protons and 7 neutrons. Which of the following isthe correct way to represent it?- A.
A
- B.
B
- C.
C
- D.
D
- 2.
A particular nuclide of iron (chemical symbol Fe) is representedas follows:
- A.
56 neutrons
- B.
26 electrons
- C.
26 neutrons
- D.
26 protons
- 3.
How many neutrons does this nuclide have?
- 4.
Which symbol represents a beta particle?
- A.
A
- B.
B
- C.
C
- D.
D
- 5.
Which symbol could represent an alpha particle?
- A.
A
- B.
B
- C.
C
- D.
D
- 6.
A radioactive nuclide X decays according to this equation:
- A.
A
- B.
B
- C.
C
- D.
D
- 7.A radioactive sample contains 8000 undecayed atoms. It hasa half-life of 4 days. What will be the number of undecayedatoms remaining after 12 days?
- 8.
The graph shows the pattern of decay of a radioactive substance.What is the half-life of the substance?
- 9.
The graph bellow shows the amount of undecayed material in a sample of a radioactive substance as it decayed. When the material had decayed to a very low level, the detector still recorded background radiation.From the graph, determine the background count rate.
- 10.
The graph bellow shows the amount of undecayed material in a sample of a radioactive substance as it decayed. When the material had decayed to a very low level, the detector still recorded background radiation.Determine the initial count rate due to the radioactive substance by calculating:initial count rate - background count rate
- 11.Which part of the atom contains most of its mass?
- A.
Shells
- B.
Orbits
- C.
Nucleus
- D.
Neutron
- 12.
The diagram shows the paths of some alpha particles as they approached a nucleus of a gold atom.Explain why the alpha particle (1) shown was back-scattered.
- A.
It's pushed back repelled by the nucleus when it passes by very near.
- B.
It's pushed back attracted by the nucleus when it passes by very near.
- C.
It's pushed back repelled by the nucleus when it passes by far away.
- D.
It's pushed back attracted by the nucleus when it passes by far away.
- 13.
The diagram shows the paths of some alpha particles as they approached a nucleus of a gold atom.Explain why the alpha particle (2) shown was undeflected as it passed the gold nucleus.
- A.
They have unlike charges.
- B.
It's too close to the nucleus.
- C.
They have like charges but it's far away from the nucleus.
- D.
All alpha particles are deflected.
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