K.C.S.E Physics Q & A - MODEL 2005PP2QN07

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 

answers