The half-life of iodine-131 is 8d. In h...

The half-life of iodine-131 is 8d. In how many days its activity will be `1/sqrt2` part of its initial value ?

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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) . After how many days the activity of Iodine-131 will be 1/16 th of its initial value. [The half-life of Iodine-131 is 8 d.] (A) 24 d (B) 32 d (C) 40 d (D) 48 d

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?

The half-life of Radon is 3.8 d. After how many days 1/20 part of some amount of Radon will remain intact?

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

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

If the half-life of a first order reaction is T s , then show that after nTs [1-(1/2)^(n)] parts of the initial concentration of the reactant will take part in the reaction.

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

Po^210 has half-life of 140 d. In 1g Po^210 how many disintegration will take place every second ? [Avogadro's number = 6.023xx10^23 ]

The half-life of a radioactive element is 8 d . If the initial mass of the element be 1 g then what amount of it will be disintegrated in 24 d ?

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