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63. Half life of isotope x is 1.73 x 10". If decay to
y which is stable then ratio of no. of atoms of
x and y is 1: 7 in a sample then age of rock is
a) 1.6 x 10° yrs
c) 5.2 x 10° yrs
64. An under water swimmer is at a depth of 12m
a)
b) 9.5 x 10"
yrs
c)
71. A
d) 5.2 x 100
yrs
...
