The half-life for electron capture for^40_19K is 1.3 billion years. What will be

Question

The half-life for electron capture for^40_19K is 1.3 billion years. What will be the^40_19 K/^40_18 Ar ratio in a rock that is 5.1 billion years old? 0.066 14 0.071 3.9 15 ANS: C PTS: 1 DIF: Easy REF: 19.4 KEY: Chemistry | general chemistry | nuclear chemistry | radioactive and nuclear bombardment reactions | rate of radioactive decay | radioactive dating MSC: Quantitative It is desired to determine the blood volume of a live mouse. To do this, 0.10 mL of a saline suspension of red blood cells labeled with^59_26 Fe is injected into the tail vein. Before injection, the gamma rays were counted for this 0.10-mL solution and the count rate found

Explanation / Answer

Half life = 0.693 / K

K = 0.693 / 1.3 = 0.533

ln A = -kt + ln Ao

ln A = - 0.533 x 5.1

A   = 0.066

Ratio = 1/ 0.066 = 15

Answer is Option E 15

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