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Gold nucleus (""(79)^(198)Au) can decay ...

Gold nucleus `(""_(79)^(198)Au)` can decay into mercuyr nucleus `(""_(80)^(198)Hg^(8))` by two decay schemes shown in figure below (i) it can emit a `beta` -particle `(beta_(1))` and come to ground state by either emiting one `gamma`- ray (` gamma_(1)`) or emitting two `gamma`- rays (`gamma_(3)` and `gamma_(4)`) (ii) It can emit one `beta`- particle `(beta_(2))` and come to ground state by emitting `gamma_(2)` ray. Atomic masses: `""^(198)Au=197.9652` amu and `""^(198)Hg=197.9662` amu. Given that 1 amu= `930MeV//c^(2)`. The energy levels of the nucleus are shown in figure below

Whatis the maximum kinetic energy of emitted `beta_(2)` particle?

A

1.44 MeV

B

0.59 MeV

C

1.86 MeV

D

1.46 MeV

Text Solution

Verified by Experts

The correct Answer is:
D
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Knowledge Check

  • Gold nucleus (""_(79)^(198)Au) can decay into mercuyr nucleus (""_(80)^(198)Hg^(8)) by two decay schemes shown in figure below (i) it can emit a beta -particle (beta_(1)) and come to ground state by either emiting one gamma - ray ( gamma_(1) ) or emitting two gamma - rays ( gamma_(3) and gamma_(4) ) (ii) It can emit one beta - particle (beta_(2)) and come to ground state by emitting gamma_(2) ray. Atomic masses: ""^(198)Au=197.9652 amu and ""^(198)Hg=197.9662 amu. Given that 1 amu= 930MeV//c^(2) . The energy levels of the nucleus are shown in figure below What is the maximum kinetic energy of emitted beta_(1) parricle ?

    A
    1.28 MeV
    B
    0.77 MeV
    C
    1.86 MeV
    D
    0.86 MeV

  • Gold nucleus (""_(79)^(198)Au) can decay into mercuyr nucleus (""_(80)^(198)Hg^(8)) by two decay schemes shown in figure below (i) it can emit a beta -particle (beta_(1)) and come to ground state by either emiting one gamma - ray ( gamma_(1) ) or emitting two gamma - rays ( gamma_(3) and gamma_(4) ) (ii) It can emit one beta - particle (beta_(2)) and come to ground state by emitting gamma_(2) ray. Atomic masses: ""^(198)Au=197.9652 amu and ""^(198)Hg=197.9662 amu. Given that 1 amu= 930MeV//c^(2) . The energy levels of the nucleus are shown in figure below The wavelength of emitted gamma - rays is the order

    A
    `lamda_(2)gtlamda_(3)gt lamda_(1)`
    B
    `lamda_(3)gtlamda_(2)gtlamda_(1)`
    C
    `lamda_(1)gtlamda_(2)gtlamda_(3)`
    D
    `lamda_(3)=lamda_(2)=lamda_(1)`

  • A gamma - ray photon is emitted

    A
    After ionization of an atom
    B
    Due to conversion of a neutron into a proton in the nucleus
    C
    After de- excitation of a nucleus
    D
    Due to conversion of a proton into a neutron in the nucleus

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