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Nuclear Fission:
Splitting the Atom You know that atoms are made up of a nucleus and electrons moving around the nucleus, and the nucleus is made up of protons and neutrons. The principal actor in the fission drama is the uranium atom. The nucleus of the Uranium 238 atom has 92 protons and 146 neutrons. About one atom in 140 atoms of uranium has 143 neutrons in its nucleus. lt is called Uranium 235. It is the Uranium 235 that is mostly used to provide fuel for nuclear furneces. Before the Second World War, two German scientists discovered that if neutrons were shot at the nuclei of Uranium 235, the nuclei split into two and produced other neutrons to repeat the process. This is called nuclear fission.
Method of science: We have seen above that science is an enaeavour to understand nature and to mould it to satisfy human needs. In earlier units we have seen that, in this pr
Observing the phases of the moon Over the time of a lunar month have the children make nightly observations and illustrate drawings of the moon. Start at new moon and continue
Discuss about the Soil Fauna The soil fauna inhabiting the soil are active partners of the soil flora in the decomposition of plant tissues. When dead leaves fall on moist so
The mop weighs less Put a floor mop in water. Wring it out and then balance it on a triangular file placed on the corner of a table. Be sure you have it carefully balanced. Loo
Define Inzmunoglobulin D - classification of antibodies Present on surface of B lymphocytes, along with IgM plays a role in Ag recognition.
As glaciers erode the surface over which they move, sets of parallel linear grooves are sometime worn into the rock surface. These grooves are known as: Striations
what are alveoli?
If rate of evaporation affects the size of crystals that grow from solution allowed to evaporate at room temperature.
Define the term Bel Bel, the unit of measurement of sound, is named after Alexander Graham Bell; Bell was the inventor of the telephone, but for some curious reason, is spelt w
Does the frequencies of the colors of the light increase from red to violet?
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