Strontium-90 is a radioactive isotope having a half-life of 28 years.Strontium-90 has a denstiy f 2.5 g `cm^(-3)`.A smaple of Strontium-90 has an activity of `6.4 xx 10^9 Bq`.Calculate
the volume of the sample.

Strontium-90 is a radioactive isotope having a half-life of 28 years.Strontium-90 has a denstiy f 2.5 g cm^(-3) .A smaple of Strontium-90 has an activity of 6.4 xx 10^9 Bq .Calculate the mass of stronitium 90 in the sample

Strontium-90 is a radioactive isotope having a half-life of 28 years.Calculate the decay constant lambda(in s^(-1)) of Strontium-90,

A radioactive isotope has a half-life of T years. How long will it take the activity to reduce to- 3.125%

An element having a density 11.2"g cm"^(-3) forms a fcc lattice with edge of 4xx10^(-3) cm. Calculate the atomic mass of the element.

The isotope Phosphorus-33 undergoes beta - decay to form Sulphur-33,which is stable.The half - life of Phosphorus-33 is 24.8 days. A pure sample of Phosphorus - 33 has an initial activity of 3.7 xx 10^6 Bq. Calculate the initial number of Phosphorus - 33 nuclei in the sample,

Uranium - 234 is radioactive and emits alpha -particles at what appears to be a constant rate.A sample of uranium - 234 of mass 2.64 mu G is found to hae an activity of 604 Bq. Calculate for the sample of Uranium -234 the half-life in years.

The isotope Phosphorus-33 (_(15)P^(33)) undergoes beta - decay to form "Sulphur"-33(_(16)S^(33)) ,which is stable.The half - life of Phosphorus-33 is 24.8 days. A pure sample of Phosphorus - 33 has an initial activity of 3.7 xx 10^6 Bq.Calculate the number of Phophorus - 33 nuclei remaining in the sample after 30 days.

A cobalt-60 source having a half-life of 5.27 years is calibrated and found to have an activity of 3.50 xx 10^5 Bq.The uncertainty in the calibration is +- 2% .Calculate the length of time.in days, after the calibration has been made, for the stated activity of 3.50 xx 10^5 Bq to have a maximum possible error of 10%.

Strontium-90 decays with the emission of a beta- particle to form Ytrium-90 .The reaction is represented by the equation _(38)Sr^(90) rarr _(39)Y^(90) + _(-1)e^0 + 0.55 MeV the decay constant is 0.025 year ^(-1) . At the time of purchase of a Stronituim-90 source the activity is 3.7 xx 10^6 Bq . Calculate ,for this sample of strontium,the initial number of atoms.