Revision as of 14:29, 2 March 2011

Outcomes

7.17 understand that a nucleus of U-235 can be split (process of fission) by collision with a neutron, and that this process releases energy in the form of kinetic energy of the fission products
7.18 recall that the fission of U-235 produces two daughter nuclei and a small number of neutrons
7.19 understand that a chain reaction can be set up if the neutrons produced by one fission strike other U-235 nuclei
7.20 understand the role played by the control rods and moderator when the fission process is used as an energy source to generate electricity

alphs, beta and gamma rays are ionising radiations emitted from unstable nuclei in a random process

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 ==Main Body of Lesson==
-* Explain in detail how Geiger and Marsden's experiment led to the current structure of the atom:
+*
-- most alpha particles going through - empty space between the nucleus and the orbit of electrons;
-- some alpha particles being deflected - nucleus posivively charged;
-- alpha particles bounced back - nucleus very dense, carries the whole mass of the atom;
-* Introduce pupils to the symbol  A¦Z X and define Z and A: Z = atomic number = number of protons inside the nucleus; A = atomic number = number of nucleons inside the nucleus.
-* Introduce the three types of radiation and pupils must understand that all three types are emitted when the nucleus is unstable.
-* Describe the nature of each type of radiation in terms of:
--what is made of
-- How is charged
-- range in air
-- speed at which it travels at
--what stops it
-(A table containing all info in Science shared)
-* use the kit containg all three sources, the Geiger-Muller counter and test them in terms of penetration (what can they be stopped by)
 ==Plenary==