Concepts Of Physics MCQ Edition [Volume 2]
- Exam
- Concepts Of Physics MCQ Edition [Volume 2]
- Subject
- Physics
- Chapter
- The Nucleus
Concepts Of Physics MCQ Edition [Volume 2] · Physics · The Nucleus
Lithium ( Z = 3 ) possesses two stable isotopes, ^ 6 Li and ^ 7 Li...
Lithium () possesses two stable isotopes, ^{6}\text{Li}. When a lithium sample is bombarded with neutrons, electrons and -particles are ejected. Identify the correct set of nuclear processes taking place.
Options
- A^{6}_{3}\text{Li} + n \to ^{7}_{3}\text{Li}
^{8}_{4}\text{Be} \to ^{4}_{2}\text{He} + ^{4}_{2}\text{He} - B^{6}_{3}\text{Li} + n \to ^{7}_{3}\text{Li}
^{8}_{4}\text{Be} \to ^{4}_{2}\text{He} + ^{4}_{1}\text{H} + n - C^{6}_{3}\text{Li} + n \to ^{7}_{4}\text{Be} + e^{-} + \bar{\nu}
^{8}_{4}\text{Be} \to ^{4}_{2}\text{He} + ^{4}_{2}\text{He} - D^{6}_{3}\text{Li} + n \to ^{7}_{3}\text{Li}
^{8}_{4}\text{Be} \to ^{4}_{2}\text{He} + ^{4}_{2}\text{He}
Correct answer
A. ^{6}_{3}\text{Li} + n \to ^{7}_{3}\text{Li}
^{8}_{4}\text{Be} \to ^{4}_{2}\text{He} + ^{4}_{2}\text{He}
Step-by-step solution
When a lithium sample containing ^{6}_{3}\text{Li} is bombarded with neutrons, the following nuclear reactions occur:
First, ^{6}_{3}\text{Li}:
^{6}_{3}\text{Li} + n \rightarrow ^{7}_{3}\text{Li} captures another neutron to form the radioactive isotope ^{8}_{3}\text{Li}
Since ^{8}_{3}\text{Li}\beta^{-}, emitting an electron () and an antineutrino ():
^{8}_{3}\text{Li} \rightarrow ^{8}_{4}\text{Be} + e^{-} + \bar{\nu} nucleus is highly unstable and immediately fissions into two -particles (^{4}_{2}\text{He}
This sequence of reactions perfectly explains the ejection of electrons and -particles.
First, ^{6}_{3}\text{Li}:
^{6}_{3}\text{Li} + n \rightarrow ^{7}_{3}\text{Li} captures another neutron to form the radioactive isotope ^{8}_{3}\text{Li}
Since ^{8}_{3}\text{Li}\beta^{-}, emitting an electron () and an antineutrino ():
^{8}_{3}\text{Li} \rightarrow ^{8}_{4}\text{Be} + e^{-} + \bar{\nu} nucleus is highly unstable and immediately fissions into two -particles (^{4}_{2}\text{He}
This sequence of reactions perfectly explains the ejection of electrons and -particles.