P4f What is Radioactivity
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Describe and recognise that the radioactivity of an object is measured by the number of nuclear decays emitted per second.
Describe and recognise that radioactivity decreases with time.
Describe that radiation comes from the nucleus.
Describe radioactive substances as decaying naturally and giving out nuclear radiation in the form of alpha, beta and gamma.
Describe radioactivity as coming from the nucleus of an atom that is unstable.
State that an alpha particle is a helium nucleus.
State that a beta particle is a fast moving electron.
Explain and use the concept of half-life.
Interpret graphical or numerical data of radioactive decay.
Describe what happens to a nucleus when an alpha particle is emitted:
- mass number decreases by 4;
- nucleus has two less neutrons;
- nucleus has two less protons;
- atomic number decreases by 2;
- new element formed.
Describe what happens to a nucleus when a beta particle is emitted:
- mass number is unchanged;
- nucleus has one less neutron;
- nucleus has one more proton;
- atomic number increases by one.
Construct and balance simple equations in terms of mass numbers and atomic numbers to represent alpha and beta decay.
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stuff what is important goes hereContent 3Content 4Content 5Content 2
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Homework:
Homework1
Objectives:
Content 1
Prior Learning:
Difficult Concepts:
Outline:
Suggested Practicals:
Extension Activities:
Homework:
Homework2 again