Question

U with atomic number 92 and mass number 238 is radioactive and it emits alpha and beta particles to form Pb with atomic number 82 and mass number 206. Calculate the number of alpha and beta particles emitted in this conversation.

An ore of U with atomic number 92 and mass number 238 is found to contain U and Pb in the weight ratio of 1:0.1. The half-life period of U is $4.5\times {10}^9$ years. Calculate the age of the ore.

• A. $6.7\times {10}^9$
• B. $7.12\times {10}^8$
• C. $8.5\times {10}^{10}$
• D. $6.6\times {10}^9$

Answer 1

The correct option is B

$7.12\times {10}^8$

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