Overview
Radioactivity 1. Complete the following equation by determining the values of U and V.
Th Pa + e
U……… V……………..
2. (a) Distinguish between nuclear fusion and fission (b) Compete the nuclear equation below:-
3. Uranium -238 disintegrates by emitting an alpha particle to form substance Y. Nuclide Y emits a beta particle to form substance Z. Write down nuclear equations to show how substance Y and Z are formed (U=At No. 92)
4. (a) What is a nuclide? (b) The graph below shows the radioactive decay of a certain nuclide. Determine the
half-life of the nuclide
(e) What effect do excessful exposures of radiation have on metals? 5. (a) State one way in which nuclear reactions differ from ordinary chemical reactions
(b) The following is a part of Uranium decay series
(i) Which particles are emitted in step I and II (ii) If a beta particle is emitted in step III, find Z and A (iii) If the activity of Thorium -234 is reduced to 25% in 48hours, find its half life
6. Substances A and B are represented by the formulae ROH and RCOOH respectively.