B- Measurements on a radioactive sample show that its activity decreases by a factor of five during a 2h interval. Calculate the half-life of isotope. O 2.2 h O 2.2 (year) O 1.6x10^-4 (year) O 1x10^-4 (year)

Radon gas has a half-life of 3.83 days. If 2.75 g of radon gas is present at time t = 0, what mass of radon will remain after 2.10 days have passed? g Need Help? Read It

By READING the N vs t graph shown below, determine No & the half-life. N (x10¹ atoms) 120 90. 60. 30. 1 2 3 4 5 6 7 8 9 10 t(y) No = half-life = atoms

in this nucluar reaction ¹¹B(d,α)⁹Be . if the Deuterium fall down with kinetic energy 2.5 Mev , while alpha's particles start moving with kinetic energy 8.5 Mev out by angle 90 degree , calculate : a- calculate value of Q for this reaction then note is it Exothermic or Endothermic reaction. b- calculate the Critical energy of this reaction .

An 8 g sample of a radioactive element takes 8.42 million years to reduce into 2 g. Calculate the half-life and identify the element.

Determine the nucleus density (in kg/m³) of the following four isotopes. 4He (m= 4.00260325415 u) 40 Ar (m 39.9623831225 u) 179TI (m 178.99109 u) 232U (m 232.0371562 u)