Introduction
Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. Because the nucleus experiences the intense conflict between the two strongest forces in nature there are many nuclear isotopes which are unstable and emit some kind of radiation.
Here you will be able to acquire knowledge of radioactivity.
Task
In order to master the topic of radioactivity watch this video from 5:20 in english:
and read this link http://hyperphysics.phy-astr.gsu.edu/hbase/Nuclear/radact.html (do not forget to click and learn about alpha, beta, gamma radiation)
After watching this video and reading the link answer the following 10 questions, which will strengthen your knowledge:
1. Radioactivity was firstly descovered by:
A) HENRI-BECQUEREL.
B) ERNEST RUTHERFORD.
C) MARIE CURIE.
2. Alpha decay is:
A) released when an unstable nucleus loses two protons and two neutrons, becoming a different element in the process.
B) released when an unstable nucleus loses two protons and two electrons, becoming a different element in the process.
C) released when an unstable nucleus loses one proton and one electron, becoming a different element in the process.
3. Is parent nucleus unstable?
A) No.
B) Yes.
C) There is not enough information given to answer this question.
4. Choose the correct statement:
A) The alpha particle is the nucleus of the xenon atom.
B) The alpha particle is the nucleus of the carbon atom.
C) The alpha particle is the nucleus of the helium atom.
5. Choose the correct statement:
A) Mass > energy.
B) Mass=energy.
6. Beta decay is:
A) when an unstable nucleus emits a beta particle, which is just a proton.
B) when an unstable nucleus emits a beta particle, which is two electrons.
C) when an unstable nucleus emits a beta particle, which is just an electron.
7. Gamma decay is:
A) results when a nucleus emits high-powered neutrons, in what are known as gamma rays.
B) results when a nucleus emits high-powered electrons, in what are known as gamma rays.
C) results when a nucleus emits high-powered photons, in what are known as gamma rays.
8. Is parent nucleus in the gamma ray in excited state?
A) Yes.
B) No.
C) There is not enough information to answer this question.
9. Complete this using periodic tabel:
82Pb-214 --> e
10. Does gamma ray have the highest radiation and penetration power requiring a large amount of led to stop their propagation?
A) Yes.
B) No.
C) It has not been descovered yet.
The answers are given in the teachers page.
Process
To be able to answer 10 questions, you have to learn the theme of the radioactivity. If the video material did not provide a complete understanding of the topic, you can use another link http://www.physics.org/article-questions.asp?id=71
Evaluation
10 questions are corresponding to 10 points so it means that for each wrong answer one less point!
Conclusion
This work will gain your knowledge about radioactivity.
Credits
Darbs veidots par radioaktivitāti, kodolreakcijām.
Izpildot darba uzdevumu skolēns nostiprina savas zināšanas.
Teacher Page
Here are the answers to all of the questions:
1.A)
2.A)
3.B)
4.C)
5.B)
6.C)
7.C)
8.A)
9. 82Pb-214-->83Bi-214 + e.
10.A)