Role of Nuclear Fusion Stars

This process, called nuclear fusion, is the energy source of all __________.

There may be more than one answer for this questions.

• planets

• suns

• stars

• plants

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Why does nuclear fusion require high pressures and temperatures?

• To provide enough energy to split the nucleus.

• The two nuclei are both negatively charged and repel each other.

• To lower the cost.

• To overcome the electrostatic repulsion of the nuclei.

Which element is used as the fuel in nuclear fusion reactions?

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Two nuclei with low masses are combined to form one nucleus of larger mass is called what?

• Nuclear fission

• Nuclear fusion

• Nuclear half-life

• Half-life

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Which of the following accurately describes the main reaction that generates the Sun's light?

• Oxygen reacts with carbon to form carbon dioxide.

• Hydrogen nuclei fuse, forming helium and releasing energy.

• Light reacts with water to form glucose.

• Iron reacts with oxygen to form iron oxide.

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What process increases the thermal energy of atoms in a star and impacts the color of light a star radiates?

• the conversion of mass into energy during nuclear fusion

• the destruction of matter caused by a star’s magnetic field

• the change of energy into mass during chemical reactions

• the melting of fuels that are located in the core of a star

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In stars, hydrogen nuclei combine with each other to form helium and other heavier elements. What is this process called?

• fission

• wave motion

• convection

• fusion

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A star is born when gas and dust from a nebula become so dense and hot that nuclear fusion starts. Which of the following forces is responsible for the formation of a star?

• friction

• gravitation

• electromagnetic energy

• magnetism

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Which of the following describes a major role of gravity in star formation?

• Gravity causes an interstellar cloud fragment to expand rapidly until it is large enough to form a star at its center.

• Asteroids passing by a solar system are pulled in by planets' gravities to form a star at the center of the solar system.

• Gravity compresses gases at the center of a solar nebula until temperatures are high enough for nuclear fusion to occur.

• The gravitational forces of planets push gases from their atmospheres to form a star at the solar system's center.

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Which of the following is true about nuclear fusion in stars?

• The process combines heavier elements to form lighter elements.

• The process releases great amounts of energy over millions or billions of years.

• The process occurs near the stars' surfaces, but not inside their cores.

• all of these

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