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  3. 1. a typical α-decay from a parent nucleus azx

1. A typical α-decay from a parent nucleus AZX may be indicated as : Group of answer...

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Physics

1. A typical α-decay from a parent nucleusAZX may be indicated as :

Group of answer choices

AZX → (A−4)(Z − 2) Y+ 42He

AZX → (A+4)(Z+2) Y +22He

AZX → (A−4)Z Y +42He

AZX → (A−4)(Z+2) Y +42He

2. An element of atomic number 83 in a relatively higher energystate decays radioactively to an element of atomic number 84 withlower energy level. This must include

Group of answer choices

an α emission

a β emission

a γ emission

a β & γ emission

3. The half- life of radium-226 is 1.6 × 103 . If asample initially contains 3.0 × 1016 such nuclei, whatis the number of radioactive radium-226 nuclei remaining after 4.8× 103 years?

Group of answer choices

2.25 × 1012

3.75 × 1016

2.2 × 1016

3.75 × 1015

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