Nuclear Physics and Radioactivity Questions

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is : (given 1u = 931 MeV)

The half life of a radioactive isotope ′X′ is 20 years. It decays to another element ′Y′ which is stable. The two elements ′X′ and ′Y′ were found to be ...

A radio isotope X with a half life 1.4 × 109 years decays of Y which is stable. A sample of the rock from a cave was found to contain X and Y in the ratio 1 : 7. The age of the rock is...

If radius of the 2713Al nucleus is taken to be RAl then the radius of 12553Te nucleus is nearly :

Radioactive material 'A' has decay constant '8 λ' and material 'B' has decay constant 'λ'. Initially they have same number of nuclei. After what time, the ratio of numbe...

In a radioactive decay chain, T90232h nucleus decays to P82212b nucleus. Let Nα and Nβ be the number of α and -β particles, respectively, emitted in this decay process. Which of the following...

The half life of a radioactive nucleus is 50 days. The time interval (t2 - t2) between the time t2 when of it has decayed and the time t1 when of it had decayed is:...

A mixture consists of two radioactive materials A1 and A2 with half lives of 20 s and 10 s respectively.Initially the mixture has 40 g of A1 and 160 g of A2. The amount of the two in the mixture will ...

Two radiactive nuclie P and Q in a given sample decay into stable nucleus R. At time t = 0,number of P species are 4N0 and that of Q are N0. Half life of P (for conservation to R)is 1 minute where as ...

The half life of a radioactive isotope X is 50 years. It decay to another element Y which is stable. The two elements X and Y were found to be in the ratio of 1 : 15 in a sample of a given rock. The a...

The power obtained in a reactor using U235 disintegration is 1000 kW. The mass decay of U235 per hour is

A radioactive nucleus of mass M emits a photon of frequency and the nucleus recoil. The recoil energy will be

Fusion reaction takes place at high temperature because

The half life of a radioactive substance is 20 minutes. The approximate time interval (t2 - t1) between the time t2 when of it has decayed and time t1 and of it had decayed is :...

A nucleus of mass M + ᐃm is at rest and decays into two daughter nuclei of equal massM/2 each. Speed of light is c.The binding energy per nucleon for the parent nucleus is E1 and that for the da...

A nucleus of mass M + ᐃm is at rest and decays into two daughter nuclei of equal massM/2 each. Speed of light is cThe speed of daughter nuclei is...

A radioactive nucleus (initial mass number A and atomic number Z) emits 3 α - particles and 2 positrons. The ratio of number of neutrons to that of protons in the final nucleus will be...

The decay constant of radio isotope is λ. If A1 A2 are its activities at time t1 and t2 respectively, the number of nuclei which have decayed during the time (t1 - t2)...

The activity of radio active sample is measured as N0 counts per minute at t = 0 and N0 /e counts per minute at t = 5 minute. The time (in minutes) at which the activity reduces to half its value is...

Fast neutrons can easily be slowed down by