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Q.

In uranium mineral, the atomic ratio NU238/NPb206 is nearly equal to one. The age (in year) of the mineral is nearly (half - life period of U-238 is 4.5 × 109 yr)

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a

4.5 × 108

b

4.5 × 109

c

3.0 × 109

d

3.0 × 108

answer is B.

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Detailed Solution

1+NU(238)NPb(238)=(2)n(1+1)=(2)n∴ n=1=tT50∴t+T50=4.5×109yr
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In uranium mineral, the atomic ratio NU238/NPb206 is nearly equal to one. The age (in year) of the mineral is nearly (half - life period of U-238 is 4.5 × 109 yr)