13 90 TL Half life of a certain rad...
Question

# 13 90 TL Half life of a certain radioactive element is such that 7/8 of a given quantity decays in 12 days. What fraction remains undecayed after 24 days? (1) 0 (2) 1/128 (3) 1/64 (4) 1/32

NEET/Medical Exams
Chemistry
Solution
205
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( # ) ( - ) For why half ( -l i^{circ}+c ) time a quantity decays halt element in 12 day ( =1-7 / 8=frac{1}{8} ) Remaining elemer( i cdot frac{1}{2} times frac{1}{2} times frac{1}{2} ) 3 half ( therefore ) ( 12=3 t_{1 / 2} ) ( t_{y_{2}}=4 ) the elemant will remain only ( frac{1}{2} ) ( therefore ) in 24 day 1 the ie ( frac{1}{64} ) comet optin is (3)