​(a) Define Radio-activity (2mks)
Radioactivity is the spontaneous disintegration of a nucleus releasing
alpha, beta and gamma radiations accompanied by the release of energy ​(b) When carrying out experiments with radioactive substances the source should never be held with bare hands but with forceps. Explain? (1mk)
​Radioactive substances are harmful to body cells when ingested
​(i) Plot on the graph paper provided the graph of the count rate (y-axis) against time​(ii) From the graph, determine the half-life of Radon-220 (1mk)
​Half-life of radon 220=54 sec + 2 (showing on graph a must)
​(e) The diagram in the figure below shows paths taken by three radiations A,B and C from a radioactive isotope through an electric field.​(i) State the charge on plate Y (1mk)
​(ii) Identify the radiations A and C (2mks)
​(iii) Give a reason why C deviates more than A (1mk)
C more massive than A
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M.A NyamotiMy passion is to see students pass using right methods and locally available resources. My emphasis is STEM courses
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