Lesson Notes By Weeks and Term v4 - SHS 2
NUCLEAR PHYSICS
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NUCLEAR PHYSICS
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Subject: Physics
Class: SHS 2
Term: 1st Term
Week: 2
Grade code: 1.4.2.LI.1
Strand code: 4
Sub-strand code: 2
Content standard code: 1.4.2.CS.1
Indicator code: 1.4.2.LI.1
Theme: ATOMIC AND NUCLEAR PH YSICS
Subtheme: NUCLEAR PHYSICS
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This lesson introduces the fundamental principles of nuclear reactions. Unlike chemical reactions which involve the rearrangement of electrons, nuclear reactions involve changes within the nucleus of an atom itself, releasing enormous amounts of energy. Understanding these reactions is crucial. In Ghana, this knowledge is applied by institutions like the Ghana Atomic Energy Commission (GAEC) in areas such as medicine (cancer treatment), agriculture (food preservation), and in our nation's quest for sustainable energy through nuclear power. Today, we will learn the simple but powerful rules that govern these changes, allowing us to "balance the books" for any nuclear reaction.
A. What is a Nuclear Reaction?
A nuclear reaction is a process that changes the structure of an atomic nucleus. This can happen spontaneously (as in radioactive decay) or when a nucleus is bombarded by another particle. Key Difference: Chemical Reaction: Involves the sharing or transfer of *valence electrons*. The nucleus is unchanged. Atoms are rearranged into new molecules (e.g., 2H₂ + O₂ → 2H₂O). Nuclear Reaction: Involves changes in the *protons and neutrons* within the nucleus. One element can be transformed into another (transmutation). (e.g., Uranium turning into Thorium). B. Standard Nuclear Notation
To understand nuclear reactions, we must first remember how to write the symbol for any nuclide (a specific type of nucleus).
The notation is: $$ ^A_Z X $$ Where: X is the chemical symbol of the element (e.g., U for Uranium, C for Carbon). A is the Mass Number (or nucleon number). It is the total number of protons and neutrons in the nucleus. Z is the Atomic Number. It is the number of protons in the nucleus. It defines the element.