Radioactivity questions | form four Physics

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#	Question
1	Complete the following equations and for each name the type of decay. (i) $_{88}^{226} extrm{Ra} ightarrow ----- +_{86}^{222} extrm{Rn}$ (ii) $_{86}^{222} extrm{Rn} ightarrow extrm{2}_{-1^{e}}^{0} + --------$ Short answers
2	What is meant by radioactive decay? Short answers
3	Give two effects of beta (β) particle on the nucleus of an atom. Short answers
4	Define the term isotope of an element. Short answers
5	The half-life of a certain radioactive substance is 64 days. Explain the meaning of this statement. Short answers
6	A certain radioactive material has a half-life of 2 minutes. If the initial count rate is 256 per minute; (i) how long does it take to reach a count rate of 32 per minute? (ii) what fraction of the original number of atoms is left undecayed? Short answers
7	What is meant by nuclear fission? Short answers
8	A uranium nucleus, U-238, with atomic number 92, emits two α-particles and two β-particles and finally forms a thorium (Th) nucleus. Write the nuclear equation for this process. Short answers
9	Define the following terms: (i) binding energy. (ii) thermonuclear fusion. Short answers
10	A sample containing 400 g of iodine-131 has a half-life of 8 days. How much of the sample will remain undecayed after 40 days? Short answers

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