21/22 First Semester Final

The energy from the sun that reaches Earth is the result of which of the following processes, repeated many times in the core of the sun?

• The nuclei of two atoms are combined to form a single atom with a larger nucleus.

• Helium atoms are rearranged to form Hydrogen atoms.

• Compounds are broken down into smaller, less complex substances.

• An atomic nucleus spontaneously splits into two separate atoms with less mass.

What element is considered the Sun’s Fuel during the Main Sequence Stage of the Star's Life Cycle?

• Hydrogen

• Helium

• UV Radiation

• Both Hydrogen and Helium

Identify the reactant(s) of nuclear fusion in the main sequence stage of the medium mass star

• Hydrogen

• Helium

• Gamma Rays

Answer explanation

Remember, reactants are what reacts in the chemical reaction. What goes in?

Identify the product(s) of nuclear fusion in the main sequence stage of the medium mass star

• Hydrogen

• Helium

• Gamma Rays

Answer explanation

Remember, products are what is produced in the chemical reaction, or what comes out.

Which of the following best describes the transfer of energy from the sun to Earth?

• Gamma Rays carry particles of matter from one location to another.

• Hydrogen atoms from the core of the sun go through nuclear fusion, causing them to explode towards Earth

• Electromagnetic waves, which include photons we see as sunlight (visible light), heat (infrared) and UV radiation, travel from the Sun to Earth

• Energy originates in the Earth and travels towards the Sun

Nuclear Fusion

• The explosion of a star

• A chemical process that happens only in high mass stars like our Sun

• All space and matter that exist

• Two smaller atomic nuclei are forced together under a massive amount of heat and pressure

What stage of the Star Cycle is A in the image shown?

• Red Supergiant

• Main Sequence Stage

• Neutron Star

• Stellar Nebula

• Black Hole

What stage of the Star Cycle is B in the image shown?

• Red Supergiant

• Main Sequence Stage

• Neutron Star

• Stellar Nebula

• Black Hole

What stage of the Star Cycle is C in the image shown?

• Red Supergiant

• Main Sequence Stage

• Neutron Star

• Stellar Nebula

• Black Hole

What stage of the Star Cycle is D in the image shown?

• Red Supergiant

• Supernova

• Neutron Star

• Stellar Nebula

• Black Hole