K.C.S.E Physics Q & A - MODEL 2005PP2QN07
(a) What is meant by radioactivity
(b) With an aid of a labeled diagram explain the working of Geiger Muller tube as a detector of radiation
(c) In an experiment to determine the half of a certain radioactivity substance, the activity in disintegrations per minute was measured for sometime. Table 1 shows the results obtaine
On the grid plot a suitable graph and sue it to determine the half life t ½ of the substance
(d) At time t = 40 minutes, the activity of a sample of a certain radioactive isotope with a half life 12 minutes if found to be 480 disintegration per minute.
Determine the time which activity was 3840 disintegrations per minute
K.C.S.E Physics Q & A - MODEL 2005PP2QN06
(a) Define the term angular velocity
(b) A body moving with uniform angular velocity is found to have covered an angular distance of 170 radians in t seconds. Thirteen seconds later it is found to have covered a total angular distance of 300 radians. Determine t.
(c) Fig 8 shows a body of mass m attached to the centre of a rotating table with a string whose tension can be measured. (The device for measuring the tension is not shown in the figure)
The tension, T on the string was measured for various values of angular velocity, w. The distance r of the body from the centre was maintained at 30cm. Table 1 shows the results obtained.
(i) Plot the graph of T (y- axis against w2)
FORM I - PHYSICS SYLLABUS
FORM II - PHYSICS SYLLABUS
FORM III - PHYSICS SYLLABUS
FORM IV - PHYSICS SYLLABUS
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