Why does helium fusion in the core of a star require higher temperatures than hydrogen fusion quizlet?

Helium fusion requires higher temperatures than Hydrogen fusion b/c larger charge (two protons in each nucleus) leads to greater repulsion. … Can a low-mass (less than 8 solar masses) star have carbon fusion?

Why must the internal temperature of a star be hotter for helium fusion reactions than for hydrogen fusion reactions?

Why must the temperature be so high? Because the electric charge of a helium nucleus is twice that of a hydrogen nucleus, it takes higher velocities (and hence higher temperatures) to overcome the electrostatic repulsion and bring helium nuclei together.

Why will helium fusion in the sun likely begin with a helium flash?

3 HE>C (triple-alpha process) because helium has two protons they need higher T to fuse. #4 why will helium fusion in the sun begin with a helium flash? rate to rocket upward rapidly, resulting in the helium flash. #5 what does the H-R diagram of a globular cluster show a horizontal branch?

Why is helium fusion in a star so much more difficult than hydrogen fusion quizlet?

Helium nuclei have more mass than hydrogen nuclei do so more kinetic energy is necessary to overcome the gravitational potential energy of the helium and allow the nuclei to get close enough for the strong force to take over. B. Carbon nuclei are more compact and dense. The strong force is too weak for fusion to occur.

How does helium fusion start in low and in high mass stars?

Low-Mass Stars fuse hydrogen into helium, the proton-proton cycle. … When the core hydrogen is used up and no more nuclear fusion occurs, the star’s outer stellar layers expand and the core shrinks. At this point, the star becomes a Subgiant Star . The star’s outer layers continue to expand and the star brightens.

What happens to a low-mass star after helium fusion begins quizlet?

What happens in a low-mass star when the core temperature rises enough for helium fusion to begin? … Helium fuses in a shell around the core. Double Shell Burning. After core helium fusion stops, helium fuses into carbon in a shell around the carbon core, and hydrogen fuses to helium in a shell around the helium layer.

What temperature does helium fusion occur?

approximately 100 million kelvin
This increases the density and temperature of the core until it reaches approximately 100 million kelvin, which is hot enough to cause helium fusion (or “helium burning”) in the core.

Why must the Sun’s rate of fusion is gradually increasing over time?

Why must the Sun’s rate of fusion gradually rise over billions of years? … Higher temperature would cause the rate of nuclear fusion to rise, which would increase the internal pressure, causing the core to expand and cool until the fusion rate returned to normal.

Why are neutrinos so difficult to detect quizlet?

Why are neutrinos so difficult to detect? They have a tendency to pass through just about any material without any interactions.

What temperature does hydrogen fusion occur?

about 100 million Kelvin
Answer: In order to fuse two hydrogen atoms two things are required: high temperature and high pressure. The minimum temperature required to fuse hydrogen is about 100 million Kelvin, which is about six times the temperature in the core of our Sun.

What temperature is required for nuclear fusion of helium to carbon?

about 100 million degrees
When the temperature in the core reaches about 100 million degrees, the helium will begin to fuse into carbon by a reaction known as the triple-alpha process, because it converts three helium nuclei into one carbon atom. This generates a great deal of heat.

What temperature is fusion?

100 million degrees
On Earth, to produce net power, fusion reactions must take place at very high temperatures of at least 100 million degrees, which is some seven times hotter than the centre of the Sun. At these very high temperatures the fusion fuel turns into a plasma.

Why do fusion reactions require high temperatures?

First, fusion requires both extremely high temperatures to give hydrogen atoms enough energy to overcome repulsion between the protons. … Second, high pressures are needed to squeeze hydrogen atoms close enough to fuse. This process is done by using intense magnetic fields, lasers, or ion beams.

Why are high temperatures needed for hydrogen fusion?

When hydrogen atoms fuse, the nuclei must come together. … High temperature gives the hydrogen atoms enough energy to overcome the electrical repulsion between the protons. Fusion requires temperatures of about 100 million Kelvin (approximately six times hotter than the sun’s core).

Why does fusion occur at high temperature?

It takes place only at extremely high temperatures. That’s because a great deal of energy is needed to overcome the force of repulsion between the positively charged nuclei. The sun’s energy comes from fusion in its core, shown in the Figure below. In the core, temperatures reach millions of degrees Kelvin.

Why does nuclear fusion require high temperatures quizlet?

Why Does Nuclear Fusion Require High Temperatures? The high temperature gives the atoms enough energy to press forward even when they are being pushed back by the protons. Without the high temperature fusion would not be able to take place.

Does fission require high temperatures?

High density, high temperature environment is required. Energy Requirement: Takes little energy to split two atoms in a fission reaction. Extremely high energy is required to bring two or more protons close enough that nuclear forces overcome their electrostatic repulsion.

Why are high temperatures required to have a star?

All main sequence stars (including the Sun) are powered by the fusion of hydrogen (H) into helium (He). Fusion of hydrogen requires temperatures of more than 10 million Kelvin. … Because fusion is so temperature-sensitive, in a main-sequence star, fusion of hydrogen into helium occurs only in the hot, dense central core.

Why are high temperatures required for hydrogen fusion quizlet?

High temperatures are required to allow the nuclei to have enough kinetic energy to overcome the electromagnetic repulsion and have the strong force attraction take place. … High temperatures magnify the strong force attraction and allow fusion to occur more readily.

Why does nuclear fusion require high temperatures and high density quizlet?

Why does nuclear fusion require high temperatures and pressures ? To bond together, two nuclei must be thrown together with great force. This is because every nucleus has a positive charge and the nuclei repel each other when they come close. … Nuclear fusion is the source of all energy the Sun releases into space.

Which of the following best explains why nuclear fusion in the Sun requires very high temperatures?

Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together? Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. … Fusion in the Sun’s core creates neutrinos.

Which planet has the highest average surface temperature and why quizlet?

Venus has the highest average surface temperature of any planet in the solar system.