If 10% of a radioactive material decays in 5 days, then find the probability of a randomly chosen nucleus to remain undecayed after 15 days in percentage is around.

If 10% of a radioactive material decays in 5 days, then the amount of original material left after 20 days is approximately.

If a radioactive material remains 25% after 16 days, then its half life will be

What is the probability that the 13th days of a randomly chosen months is Friday?

If 10% of a radioactive substance decays in every 5 year, then the percentage of the substance that will have decaed in 20 years will be .

If 10% of a radioactive substance decays in every 5 year, then the percentage of the substance that will have decaed in 20 years will be .

_(87)^(221) Ra is a radioactive substance having half life of 4 days .Find the probability that a nucleus undergoes decay after two half lives

20% of a radioactive substances decay in 10 days . Calculate the amount of the original material left after 30 days.

A radioactive material has half-life of 10 days. What fraction of the material would remain after 30 days ?

Half life of a radioactive sample is 4 days. After 16 days how much quantity of matter remain undecayed :

80% of the radioactive nuclei present in a sample is found to remain undecayed after one day. The percentage of undecayed nuclei left after two days will be a. 64 b. 20 c. 46 d. 80