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Chapter 18: Problem 4

What nuclear reaction happens when two small nuclei combine?

Short Answer

Expert verified
When two small atomic nuclei combine, it causes a nuclear reaction known as nuclear fusion. The most common example of this is the process that powers the sun and other stars, where hydrogen nuclei combine to form helium, releasing a large amount of energy in the process.

Step by step solution

01

Understanding Nuclear Reactions

Nuclear reactions involve changes in an atom's nucleus and are thus different from chemical reactions, which only involve changes in the electrons surrounding the nucleus. In particular, this question is about what happens when two small nuclei combine.
02

Define Nuclear Fusion

In nuclear physics, when two small nuclei combine to form a larger one, it is called nuclear fusion. This is a reaction where two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles (neutrons or protons). The difference in mass between the reactants and products is manifested as energy.
03

Example of Nuclear Fusion

An example of nuclear fusion is the reaction occurring in the sun and other stars. Hydrogen nuclei come together to form helium. In this process, a lot of energy gets released, which is what makes stars shine. The process can be summarized in the following equation. \[4 \, ^1H \rightarrow ^4He + 2e^+ + 2\nu_e + \text{energy} \]

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Nuclear Reactions
Nuclear reactions are fundamentally different from chemical reactions. They involve changes deep within an atom, namely in its nucleus. Unlike chemical reactions that involve the exchange or sharing of electrons, nuclear reactions cause alterations to the protons and neutrons inside the nucleus. This often results in the formation of different elements altogether.

When nuclear reactions occur, they can either release or absorb large amounts of energy. Some common types of nuclear reactions include:
  • Fission: Splitting a large nucleus into two smaller ones.
  • Fusion: Combining small nuclei to form a larger one.
  • Radioactive decay: Spontaneous disintegration of a nucleus releasing radiation.
These reactions drive many natural processes in the universe, most notably the energy production in stars.
Nuclear Physics
Nuclear physics is the branch of physics that studies the constituents and behavior of atomic nuclei. It helps us understand the fundamental particles that make up our universe and their interactions.

Key concepts in nuclear physics include:
  • Atomic Nuclei: Comprised of protons and neutrons, the nucleus makes up the bulk of an atom's mass.
  • Forces: The strong nuclear force holds the protons and neutrons together, while the electromagnetic force affects their interactions.
  • Energy Levels: Nuclei, like electrons in an atom, have discrete energy levels.
  • Decay and Reactions: Processes such as fusion, fission, and radioactive decay.
Leaps in nuclear physics have led to advancements such as nuclear energy and medical imaging technologies, reflecting its profound impact on both science and daily life.
Energy Release in Stars
Stars are luminous balls of gas, primarily hydrogen and helium, that release energy through nuclear fusion. At their cores, immense pressure and temperature cause hydrogen nuclei to merge, producing helium and energy. This process is known as stellar nucleosynthesis.

Energy release by stars is crucial for several reasons:
  • Light and Heat: The fusion in stars emits light and heat, which are essential for life on Earth.
  • Balancing Forces: The energy counters gravitational pull, keeping stars stable.
  • Lifecycle of Stars: Fusion dictates a star's evolution, from its birth to potential outcomes like supernovae or black holes.
In essence, nuclear fusion not only fuels stars but also creates the heavier elements found throughout the universe. This continuous cycle of fusion and energy release is what makes the sun and countless other stars shine brightly in the night sky.

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Most popular questions from this chapter

a. What role does a neutron serve in starting a nuclear chain reaction and in keeping it going? b. Why must neutrons in a chain reaction be controlled? c. Why must there be a minimum mass of material in order to sustain a chain reaction?

Calculate the neutron-proton ratios for the following nuclides, and determine where they lie in relation to the band of stability. \begin{equation}a. _{92}^{235} \mathrm{U}\end{equation} \begin{equation}b. _{8}^{16} \mathrm{O}\end{equation} \begin{equation}c. _{26}^{56} \mathrm{Fe}\end{equation} \begin{equation}c. _{60}^{156} \mathrm{Nd}\end{equation}

The half-life of an element \(X\) is 5.25 y. How many days are required for one-fourth of a given amount of \(X\) to decay?

How does acute radiation exposure differ from chronic radiation exposure?

Why do animals contain the same ratio of carbon-14 to carbon-12 as plants do?
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