Advertisements
Advertisements
प्रश्न
Define 'activity' of a radioactive substance ?
Advertisements
उत्तर
The total decay rate of a radioactive sample is called the activity of the sample. Its S.I. unit is Becquerel (Bq).
APPEARS IN
संबंधित प्रश्न
Obtain the relation between the decay constant and half life of a radioactive sample.
Write symbolically the process expressing the β+ decay of `""_11^22Na`. Also write the basic nuclear process underlying this decay.
In a given sample, two radioisotopes, A and B, are initially present in the ration of 1 : 4. The half lives of A and B are respectively 100 years and 50 years. Find the time after which the amounts of A and B become equal.
In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following particles is emitted in the decay?
Lithium (Z = 3) has two stable isotopes 6Li and 7Li. When neutrons are bombarded on lithium sample, electrons and α-particles are ejected. Write down the nuclear process taking place.
Disintegration rate of a sample is 1010 per hour at 20 hours from the start. It reduces to 6.3 x 109 per hour after 30 hours. Calculate its half-life and the initial number of radioactive atoms in the sample.
A radioactive element disintegrates for an interval of time equal to its mean lifetime. The fraction that has disintegrated is ______
Which one of the following nuclei has shorter meant life?
Which sample, A or B shown in figure has shorter mean-life?
What is the half-life period of a radioactive material if its activity drops to 1/16th of its initial value of 30 years?
