Chapter 14 – Nuclear Physics and Radioactivity
Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 14 - Nuclear Physics and Radioactivity
The half life of a radioactive substance is 20 minutes . The approximate time interval (t2−t1) between the time t2 when 2/3 of it had decayed and time t1 when 1/3 of it had decay is
17
Jun
The half life of a radioactive substance is 20 minutes . The approximate time interval (t2−t1) between the time t2 when 2/3 of it had decayed and time t1 when 1/3 of it had decay is The half life of a radioactive substance is 20 minutes . The approximate time interval (t2−t1) between the time [...]
The half-life period of a radioactive element x is same as the mean life time of another radioactive element y. Initially, both of them have the same number of atoms. Then, (a) x and y have the same decay rate initially (b) x and y decay at the same rate always (c) y will decay at a faster rate than x (d) x will decay at a faster rate than y
17
Jun
The half-life period of a radioactive element x is same as the mean life time of another radioactive element y. Initially, both of them have the same number of atoms. Then, (a) x and y have the same decay rate initially (b) x and y decay at the same rate always (c) y will decay [...]
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(a) x and y have the same decay rate initially (b) x and y decay at the same rate always (c) y will decay at a faster rate than x (d) x will decay at a faster rate than y ,
both of them have the same number of atoms. Then ,
The half-life period of a radioactive element x is same as the mean life time of another radioactive element y. Initially ,
A radioactive sample has half-life of 5 years. Probability of decay in 10 years will be.
17
Jun
A radioactive sample has half-life of 5 years. Probability of decay in 10 years will be. A radioactive sample has half-life of 5 years. Probability of decay in 10 years will be. June 17, 2021 Category: Cengage NEET by C.P Singh , Chapter 14 - Nuclear Physics and Radioactivity , Part 2 ,
The count rate from 100cm^3 of a radioactive liquid is c. Some of this liquid is now discarded. The count rate of the remaining liquid is found to be c/10 after three half-lives. The volume of the remaining liquid, in cm^3, is
17
Jun
The count rate from 100cm^3 of a radioactive liquid is c. Some of this liquid is now discarded. The count rate of the remaining liquid is found to be c/10 after three half-lives. The volume of the remaining liquid, in cm^3, is 90% of the active nuclei present in a radioactive sample are found to [...]
A radioactive isotope X with a half-life of 1.37×10^9 years decays to Y which is stable. A sample of rock from the moon was found to contain both the elements X and Y which were in the ratio of 1:7. The age of the rock is.
17
Jun
A radioactive isotope X with a half-life of 1.37×10^9 years decays to Y which is stable. A sample of rock from the moon was found to contain both the elements X and Y which were in the ratio of 1:7. The age of the rock is. 90% of the active nuclei present in a radioactive [...]
Two radioactive substances A and B have half lives of T and 2T respectively. Samples of a and b contain equal number of nuclei initially. After a time 4T, the ratio of the number of undecayed nuclei of A to the number if undecayed nuclei of A to the number of undeacyed nuclei of B is
17
Jun
Two radioactive substances A and B have half lives of T and 2T respectively. Samples of a and b contain equal number of nuclei initially. After a time 4T, the ratio of the number of undecayed nuclei of A to the number if undecayed nuclei of A to the number of undeacyed nuclei of B [...]
90% of the active nuclei present in a radioactive sample are found to remain undecayed after 1 day. The percentage of undecayed nuclei left after two days will be
17
Jun
90% of the active nuclei present in a radioactive sample are found to remain undecayed after 1 day. The percentage of undecayed nuclei left after two days will be 90% of the active nuclei present in a radioactive sample are found to remain undecayed after 1 day. The percentage of undecayed nuclei left after two [...]
The activity of a sample of radioactive material is A1 at time t1 and A2 at time t2(t2 > t1). If its mean life is T, then
17
Jun
The activity of a sample of radioactive material is A1 at time t1 and A2 at time t2(t2 > t1). If its mean life is T, then The activity of a sample of radioactive material is A1 at time t1 and A2 at time t2(t2 > t1). If its mean life is T then June [...]
The half-life of 215 At is 100 μs. The time taken for the radioactivity of sample of 215 At to decay to 1/16 th of its initial value is
17
Jun
The half-life of 215 At is 100 μs. The time taken for the radioactivity of sample of 215 At to decay to 1/16 th of its initial value is The half-life of 215 At is 100 μs. The time taken for the radioactivity of sample of 215 At to decay to 1/16 th of its [...]
The half- life of radioactive radon is 3.8 days. If the initial mass of radon is 150 mg the mass remaining undecayed after 38 days is
17
Jun
The half- life of radioactive radon is 3.8 days. If the initial mass of radon is 150 mg the mass remaining undecayed after 38 days is The half- life of radioactive radon is 3.8 days. If the initial mass of radon is 150 mg the mass remaining undecayed after 38 days is June 17, 2021 [...]