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JEE 2020: Nuclear Physics Quiz (01.10.2019)

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Question 1

A high energy gamma ray while passing through the strong electric field of the nucleus sometimes gives rise to a particle and antiparticle. This phenomenon is called

Question 2

Let Fpp, Fpn and Fnn denote the magnitude of the net force by a proton on a proton, by a proton on a neutron and by a neutron on a neutron respectively. Neglect gravitational force. When the separation is 1 fm, -

Question 3

In the nuclear fusion reaction, given that the repulsive potential energy between the two nuclei is −7.7 × 1014 J, the temperature at which the gases must be heated to initiate the reaction is nearly [Boltzmann’s constant k = 1.38 × 1023 J/K]

Question 4

The compound unstable nucleus often decays in accordance with the following reaction other particles
In the nuclear reaction presented above, the other particles might be

Question 5

It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is pd; while for its similar collision with carbon nucleus at rest, fractional loss of energy is pc. The values of pd and pc are, respectively:

Question 6

An unstable element X undergoes alpha decay to produce element Y. Determine the disintegration energy during this radioactive decay assuming that the atomic mass of X is 25.7123 u and that of Y is 21.1321 u ( Mass of alpha particle = 4.001203 u)
 Y + α

Question 7

The binding energy per nucleon of deuteron and helium nucleus is 1.1 MeV and 7 MeV respectively. If two deuteron nuclei react to form a single helium nucleus, then the energy released is

Question 8

If M0 is the mass of an oxygen isotope 8O17, MP and MN are the masses of a proton and a neutron respectively, the nuclear binding energy of the isotope is

Question 9

A radioactive nucleus has a single decay mode with half life . Another radioactive nucleus has two decay modes 1 and 2. If decay mode 2 were absent, the half life of would have been . If decay mode 1 were absent, the half life of would have been 3 . If the actual half life of is , then the ratio is

Question 10

Two species of radioactive atoms are mixed in equal number. The disintegration constant of the first species is and of the second is /3. After a long time the mixture will behave as a species with mean life of approximately
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