Q89. The half-life of 226Ra is 1620 years. What is the number of atoms that decay per second in a 1 g sample of radium? (Avogadro's number, NA = 6.023 × 1023 mol-1)Physics — NUST Mock By IBAGRADS 5 — Question 89 of 200A. 4.23 × 109B. 3.16 × 1010C. 3.61 × 1010D. 2.16 × 1010Practice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →