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Nuclei

Question
CBSEENPH12047751
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In radioactive decay process, the negatively charged emitted -particles are 

  • the electrons present inside the nucleus

  • the electrons produced as a result of the decay of neutrons inside the nucleus

  • the electrons produced as a result of collisions between atoms

  • the electrons orbiting around the nucleus

Solution

B.

the electrons produced as a result of the decay of neutrons inside the nucleus

(1) Beta decay can involve the emission of either electrons or positrons. The electrons or positrons emitted in a β-decay do not exist inside the nucleus. They are only created at the time of emission, just as photons are created when an atom makes a transition from higher to a lower energy state.
(2) In negative β-decay a neutron in the nucleus is transformed into a proton, an electron and an antineutrino. Hence, in radioactive decay process, the negatively charged emitted particles are the electrons produced as a result of the decay of neutrons present inside the nucleus.

Some More Questions From Nuclei Chapter

The above is a plot of binding energy per nucleon Eb, against the nuclear mass M; A, B, C, D, E, F correspond to different nuclei. Consider four reactions:

(i) A + B → C + ε  (ii) C → A + B + ε
(iii) D + E → F + ε and (iv) F → D + E +ε

where ε is the energy released? In which reaction is ε positive?

This question contains Statement -1 and Statement-2. Of the four choices given after the statements,
Choose the one that best describes the two statements.
Statement – I: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
and
Statement – II: For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.

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

In gamma-ray emission from a nucleus

When 3Li7 nuclei are bombarded by protons, and the resultant nuclei are 4Be8 , the emitted particles will be

The ‘rad’ is the correct unit used to report the measurement of

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