Nucleosynthesis

Week1_Q3

STELLAR
NUCLEOSYNTHESIS: RISE OF
THE STARS!

Give evidence for and describe the formation of

heavier elements during star formation and

evolution

MELC

Multiple Choice

In Which stage do massive stars explode and release large amount of energy?

• main sequence

• protostar

• supernova

• white dwarf

Multiple Choice

Which if the following is the most accepted theory about the formation of the universe that explains why it continues to expand?

• Big Bang theory

• Divine creation theory

• Steady state theory

• oscillating theory

Multiple Choice

Which of the following elements DOES NOT belong to the group?

• beryllium

• silicon

• iron

• oxygen

Multiple Choice

Which phase of star life cycle is our sun?

• main sequence star

• planetary nebula

• red giant

• white dwarf

Multiple Choice

Which of the following process is responsible for the formation of elements at the center of star?

• big bang nucelosynthesis

• nuclear fusion

• stellar nucelosynthesis

• supernova nucleosynthesis

Open Ended

How would you describe the picture? Why do stars behave differently?

​Tri alpha process happens in red giant star once they leave the stage of main sequence star. This is how three Helium-4 are converted into Carbon.

​A star accumulates more mass and continues to grow into red super giant. Alpha particle fusion happens at its core and creates more heavy elements until Iron. This is known as the Alpha ladder process.

Neutron Capture

​a neutron is added to a seed nucleus. Below is the representation of how neutron is captured and heavier nucleus is formed.

S – process or slow process

​happens when there is a

slow rate of capturing neutron while there is a faster rate of radioactive decay hence increasing the proton by 1.

R- process or rapid process

​R-process or rapid process means that there is faster rate of capturing neutron before it undergoes radioactive decay thus, more neutrons can be combined at the nucleus. This is what happens in a supernova forming heavier elements than Iron with the process known as supernova nucleosynthesis.

Match

Match the following

• Nuclear fusion that happens in red super giant star and creates more heavy elements until Iron
  

• Process wherein light elements such as Helium and Hydrogen form.
  

• This happens in massive star which convert Hydrogen into Helium.
  

• Addition of neutron to form heavier nuclei
  

• Nuclear fusion reaction where Hydrogen is converted to Helium
  

Alpha ladder process

Big Bang Nucleosynthesis

CNO cycle

Neutron Capture

Ptoton-proton chain

• Alpha ladder process

• Big Bang Nucleosynthesis

• CNO cycle

• Neutron Capture

• Ptoton-proton chain

Match

Match the following

• There is faster rate of capturing neutron before it undergoes radioactive decay
  

• Happens when there is a slow rate of capturing neutron while there is a faster rate of radioactive decay
  

• Process by which elements are created within the star
  

• A process where elements heavier than Iron are formed.
  

• This is how three Helium-4 is converted into Carbon in red giant star
  

R-process

S- process

Stellar Nucleosynthesis

Supernova Nucleosynthesis

Tri-alpha

• R-process

• S- process

• Stellar Nucleosynthesis

• Supernova Nucleosynthesis

• Tri-alpha

PT # 1: Story of your Life

Write a story which relates the events of your life from
past, present and future to the life cycle of a star. Use
also those elements which could symbolize something
or anything in your story.

Rubrics for Story of Your Life

Criteria

Excellent (5 points)

Fair ( 3 points)

Poor (1 point)

Overall Effort

Work shows time, effort and
neatness that enhances the
overall written output.

Work shows time and
effort put into it.

Lacks effort and
cleanliness.

Background context

The student’s contains
background and context and
shows how world events have
significantly affected his/her
life

The project contains
discussion of world
events but it is unclear
how they have affected
the student’s life.

No background or
contextual information is
included.

Grammar and spelling

The student does not commit
error when it comes to
grammar and spelling.

The student commits
1-3 grammar mistakes
and spelling.

The student commits more
than 4 mistakes in
grammar and spelling.

Content

Student includes information
about birth,hobbies, and is
able to tie his/her story to the
topic given.

Student includes very
few details. output is
somewhat tied up with
the topic.

Information included is not
related to the task or no
attempt was made.

References: