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the rate of radioactive disintegration at an instant for a radioactive sample of half life 2.2*10^9 s is 10^10 .the no. of radioactive atoms in that sample at that instant is

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Q. The disintegration rate of a certain radioactive sample at any instant is 4750 dpm. Five minutes later, the rate becomes 2700 dpm. The half life of sample is :

Q. The disintegration rate of a certain radioactive sample at any instant is

4750

dpm. Five minutes later, the rate becomes

2700

dpm. Calculate half life of sample.

Q. The disintegration rate of a certain radioactive sample at any instant is 4750 dpm (disintegration per minute). Five minutes later, the rate becomes 2700 dpm. Calculate half-life of sample.

Q. The activity of a freshly prepared radioactive sample is

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10^{9}

s. The mass of an atom of this radioisotopes is

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. The mass (in mg) of the radioactive sample is .....

State the law of radioactive decay. Arrive at the expression for the number of radioactive atoms in a sample at an instant.

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