Question and Answer Health Occupation Contents Solution 1a 3 Solution 1b 3 Solution 2a 3 Solution 2bi 4 Solution 2bii 4 Solution 3ai 4 Solution 3aii 5 Solution 3b 5 Solution 3c 5 Solution 3d 5 Solution 4a 6 Solution 4b 6 Solution 4c 6 Solution 1a As given in question, Half life 2.72*365*24*60*60 = 85777920 seconds, Avogadro’s Number = 6.022 x 1023