JEE Main 2022 · 28 Jun · Shift 2 · Chemistry Q85

ChemistryInteger+4 / -1Question 85 of 90

A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is ______. (Nearest integer)

(Given : antilog 0.125 = 1.333, antilog 0.693 = 4.93)

Your answer

Answer and worked solution

Official answer: 75

Fraction left. $2^{-83/200}=10^{-0.125}=\frac1{1.333}\approx0.75$ .

Answer: 75

JEE Main 2022 · 28 Jun · Shift 2, Chemistry question 85