The half life of radium is 1600 years. In how many years will `8 xx10^-3 kg` of radium become `1 xx10^-3 kg`?

Half-life of radium is 1500 y. In how many years will 1 g of pure radium reduce by 1 mg ?

Half-life of radium is 1622 years'- what do you mean by this statement ?

The half-life of Radium-226 is 1600 years. What will be the activity of a sample containing 1 mg of this element. Given, Avogadro number = 6.023xx10^23.mol^(-1) .

A sum of money becomes 2-times at the rate of compound interest in 15 years. In how many years, it will becomes 8 times at the same of compound interest?

The half-life of an isotope of carbon is 6000 y. In how many years the amount this isotope in a sample will be 1/8 th part of its initial amount?

A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to four times itself?

Half-life of thorium is 1.5xx10^10 y. How much time is needed for 20% of thorium to disintegrate ?

A radioactive isotope has a half-life of 10 years. How long will it take for the activity to reduce to 3.125% ?

The initial number of radioactive atoms in a radioactive sample is N_0 . If after time t the number of becomes N, then N=N_0e^(-lambdat) , where lambda is known as the decay constant of the element. The time in which the number of radioactive atoms becomes half of its initial number is called the half-life (T) of the element. The time in which the number of atoms falls to 1/e times of its initial number is the mean life (tau) of the element. The product lambdaN is the activity (A) of the radioactive sample when the number of atoms is N. The SI unit of activity is bequerel (Bq)' where 1 Bq = 1 decay. s^(-1) . The half-life of Iodine-131 is 8 d. What is the activity (in Bq) of 1 g of Iodine? (A) 2.3xx10^15 (B) 4.6xx10^15 (C) 6.9xx10^15 (D) 9.2xx10^15

The initial number of radioactive atoms in a radioactive sample is N_0 . If after time t the number of becomes N, then N=N_0e^(-lambdat) , where lambda is known as the decay constant of the element. The time in which the number of radioactive atoms becomes half of its initial number is called the half-life (T) of the element. The time in which the number of atoms falls to 1/e times of its initial number is the mean life (tau) of the element. The product lambdaN is the activity (A) of the radioactive sample when the number of atoms is N. The SI unit of activity is bequerel (Bq)' where 1 Bq = 1 decay. s^(-1) . The half-life of Iodine-131 is 8 d. Its mean life (in SI) is - (A) 4.79xx10^5 s. (B) 6.912xx10^5 s. (C) 9.974 xx 10^5 s. (D) 22.96xx10^5 s.