Q. A sample contains an isotope of magnesium, 27 Mg, which undergoes decay with a half-life of 9.46 min. A Geiger-counter measured the activity

Q. A sample contains an isotope of magnesium, ₂₇Mg, which undergoes β decay with a half-life of 9.46 min. A Geiger-counter measured the activity of the sample to be 1.69×10²¹ Bq. Calculate the decay constant. How many moles of the isotope are present in the sample? How many radioactive isotopes are present after one hour? What is the activity of the sample after 10 h?