Question

Calculate the age of a vegetarian beverage whose tritium content is only 15% of the level in living plants. Given $t_{1/2}$ for ${}_1{\text{H}}^3=12.3$ years.

• A. $33.67$ years
• B. $336.7$ years
• C. $3.367$ years
• D. None of these

Answer 1

Answer: (A)

$33.67$ years

$t_{1/2}=\frac{0.693}{k}$

Find k from above equation

Next $t=\frac{2.303}{k}log\frac{a}{a-x}$

$a-x$ = $0.15a$

Putting these values in the equation, we get $t=33.6$ years