10b Radioactivity II

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Question 1 of 10

1. Question
1 point(s)
An unstable nuclide, X decays to become a nuclide Y, by emitting an alpha particle. Which of the following is true about the change of its proton and nucleon number?
- Proton number: +1
  Nucleon number: remains unchanged
- Proton number: -2
  Nucleon number: -4
- Proton number: -1
  Nucleon number: remains unchanged
- Proton number: +2
  Nucleon number: +4
Correct

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Question 2 of 10

2. Question
1 point(s)
The equation above shows the beta decay of atom X. The increase of proton number after the decay is due to
- Destruction of a neutron in the process.
- presence of a new proton in the nucleus from the disintegration of a neutron.
- the proton absorbed from a nearby nucleus.
- creation of proton from the nuclear energy produced.
Correct

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Question 3 of 10

3. Question
1 point(s)
The equation above shows a radioactive decay. This equation represents the emission of _______________.
- an alpha particle
- a beta particle
- a gamma ray
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Question 4 of 10

4. Question
1 point(s)
The equation in the diagram represents the radioactive decay of radium. What X and Y are?
- X is alpha-particle, Y is beta particle.
- X is alpha-particle, Y is gamma ray.
- X is beta-particle, Y is alpha particle.
- X is beta-particle, Y is gamma ray.
Correct

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Question 5 of 10

5. Question
1 point(s)
The nucleus of uranium-238 undergoes a series of radioactive decay and becomes a new nuclide Z. The process is represented by the equation shown in the diagram. What is the number of alpha and beta particles emitted in the process?
- Alpha particles: 4
  Beta particles: 3
- Alpha particles: 3
  Beta particles: 4
- Alpha particles: 3
  Beta particles: 2
- Alpha particles: 2
  Beta particles: 3
Correct

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Question 6 of 10

6. Question
1 point(s)
The half-life of Iodine-131 is 8 days. This means that
- All the Iodine-131 atoms will disintegrate in 8 days.
- ¾ of the Iodine-131 atoms will have disintegrated after 16 days.
- Half of the Iodine-131 atoms will have disintegrated after 8 hours
- 1/8 Iodine-131 atoms will have disintegrated after 1 day.
Correct

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Question 7 of 10

7. Question
1 point(s)
A radioactive substance has half-life of 6 hours. How long will it take for its mass to become 1/16 of its original mass?
- 12 hours
- 18 hours
- 24 hours
- 30 hours
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Question 8 of 10

8. Question
1 point(s)
The equation shows the disintegration of radioactive element X to become element Y (which is not radioactive). If the initial mass of X is 40g, determine the mass of X and Y after 1 hour. [Half-life of X is 15 minutes]
- Element X: 20g
  Element Y: 20g
- Element X: 5g
  Element Y: 5g
- Element X: 5g
  Element Y: 35g
- Element X: 2.5g
  Element Y: 2.5g
- Element X: 2.5g
  Element Y: 37.5g
Correct

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Question 9 of 10

9. Question
1 point(s)
A spark counter can be used to detect
- I. Alpha particles
- II. Beta particles
- III. Gamma ray
Correct

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Question 10 of 10

10. Question
1 point(s)
The diagram above shows the cloud tracks observed in a cloud chamber. Match the cloud tracks with their corresponding radioactive radiations.
- P: Alpha
  Q: Beta
  R: Gamma
- P: Alpha
  Q: Gamma
  R: Beta
- P: Beta
  Q: Alpha
  R: Gamma
- P: Gamma
  Q: Beta
  R: Alpha
Correct

Incorrect