JEE Main 202116 Mar, Evening shiftPhysicsMediumAtoms and Nuclei183× since 2002
The half-life of Au¹⁹⁸ is 2.7 days. The activity of 1.50 mg of Au¹⁹⁸ if its atomic weight is 198 g mol^1 is, (N_a = 6 10²³/mol).
JEE Main 2021 · 16 Mar, Evening shift · Q6105