K.C.S.E Physics Q & A - MODEL 2001PP1QN34
The following reaction is part of a radioactive series:
Identify the radiation r and determine the values of b and c.
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K.C.S.E Physics Q & A - MODEL 2000PP1QN36
The graph in Fig 20 shows the disintegration per second versus time in seconds, s for a sample of radioactive material; determine the half – life of the sample.
K.C.S.E Physics Q & A - MODEL 1999PP2QN06
a) Explain the following observations: ice cube float on water and solid benzene sinks in liquid benzene.
bi) You are provided with the following: An overflow can - A beaker -A spring balance A metal block -Water and - String Describe an experiment to verify Archimedes principle. ii) A block of wood weighing 2.0N is held under water by a string attached to the bottom of a container. The tension in the string is 0.5N. Determine the density of the wood. ci) Define half – life of a radioactive material. ii) Figure 6 shows a graph of the variation of the number of atoms of a certain radioactive material with time. Figure6: Determine the half – life of the material
K.C.S.E Physics Q & A - MODEL 1999PP1QN35
A radioactive nuclide of atomic number z emits a beta particle and gamma rays. State the atomic number of the new nuclide.K.C.S.E Physics Q & A - MODEL 1998PP1QN12
The activity of a radioactive substance, initially at 400 counts per second reduces to 50 counts per second in 72 minutes. Determine the half – life of the substance.
K.C.S.E Physics Q & A - MODEL 1997PP1QN34
A lithium atom has 3 protons in its nucleus. Complete the diagram in figure 14 by marking X in the appropriate shells show the electron distribution when the atom is not excited
In a sample there are 5.12 x 1020 atoms of krypton – 92 initially. If the half of krypton; 92 is 3.0s determine the number of atoms that will have decayed after 6s.
K.C.S.E Physics Q & A - MODEL 1995PP1QN32
A radioactive carbon 14 decay to Nitrogen by beta emission as below
Determine the values of x and y in the equation
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