PHY. SCI -QUIZ 3

It is a type of reaction that produces heavier elements from lighter ones.

• Nuclear fusion

• Nuclear fission

• Combustion

• Decomposition

It is the lightest element and the starting point of nuclear fusion reactions in stars.

• Helium

• Hydrogen

• Carbon

• Nitrogen

It is the process that uses kinetic energy of protons to form helium-4 from hydrogen

• Proton-proton chain

• CNO cycle

• nuclear fission

• Beta decay

What characteristic of the stars determines whether the energy comes from the proton-proton fusion or carbon-nitrogen-oxygen cycle?

• Distance from the earth

• Mass

• Shape

• Distance from another star

What type of reaction occurs in more massive and hotter stars than the sun?

• Hydrogen-helium cycle

• Proton-proton fusion

• Carbon-nitrogen-oxygen cycle

• Proton-neutron fusion