Hi Im new

 

Why is hydrogen nucleus also referred to as a proton in the nuclear fusion reaction?

 

Thanks A lot, and look forward to meeting you all

 

 

Dr_Freak

it depends on what isotope. it could be a proton and any number of neutrons

I wanted to know why Hydrogen Fusion is sometime called a proton in the nuclear fusion reaction, in general.

 

Thank you

You probably know that hydrogen the element has a proton in its nucleus and one electron. But the H+ ion is missing its electron, so it is simply a proton.

Thank you for your answers to the above question.

 

My next question is:

In the proton - proton cycle there are 2 forms of helium. Helium-3 and helium-4. Refering to the atomic structure, explain the difference between these two forms of helium.

 

Thank you, your help is appreciated

He3 has 1 neutron, He4 has 2

Hehe... look more like a homewrok question to me!

Your prompt answers are much appreciated

 

There was a question about 3 pieces of evidence for the Big Bang Theory

 

I searched Google only to find Essays of writing.

I was wondering if anybody had any information on this to help me obtain the answer.

 

 

Thanks

Dr Freak

If I remember/understood it correctly then it's: 1) Background radiation. 2) Expansion of the univers. 3) hmmm...Nothing seems to pop up...

I searched Google too and found this:

http://www.leyada.jlm.k12.il/proj/black/evidence.htm

Does this help? Or did you find that one already?

The link FireDragon52 provided seems good, rather similar to what I found myself: http://www.big-bang-theory.com/

 

Big Bang Theory - Evidence for the Theory

What are the major evidences which support the Big Bang theory?

 

* First of all, we are reasonably certain that the universe had a beginning.

* Second, galaxies appear to be moving away from us at speeds proportional to their distance. This is called "Hubble's Law," named after Edwin Hubble (1889-1953) who discovered this phenomenon in 1929. This observation supports the expansion of the universe and suggests that the universe was once compacted.

* Third, if the universe was initially very, very hot as the Big Bang suggests, we should be able to find some remnant of this heat. In 1965, Radioastronomers Arno Penzias and Robert Wilson discovered a 2.725 degree Kelvin (-454.765 degree Fahrenheit, -270.425 degree Celsius) Cosmic Microwave Background radiation (CMB) which pervades the observable universe. This is thought to be the remnant which scientists were looking for. Penzias and Wilson shared in the 1978 Nobel Prize for Physics for their discovery.

* Finally, the abundance of the "light elements" Hydrogen and Helium found in the observable universe are thought to support the Big Bang model of origins.

My gratitude to all those who have helped me in my few questions.

 

Does anybody know "5 effects of Black Holes."

This could be a little tough!!

 

 

Thanks, Dr Freak

-Gravitational effect(obviously)

-Lensing effect(it bends space such that light paths are curved.)

-Hawking radiation(still largely theoretical)

-Polar 'jets'(most likely caused by uncoiling of magnetic fields)

-Galactic formation(act as the seed around which galaxies grow)

Thank you Thales for your prompt reply.

 

My Last question that I was interested in is

"In the proton - proton cycle there are 2 forms of helium. Helium-3 and helium-4. Refering to the atomic structure, What is the difference between these two forms of helium???"

 

 

Thank you online helpers

Helium 3 has 3 nucleons (two protons and one neutron)

Helium 4 has 4 nucleons (two protons and two neutrons)

 

An element is defined by the number of protons. When there is a proton/neutron imbalance it is usually refered to as an isotope of that element.

Helium 3 has 3 nucleons (two protons and one neutron)

Helium 4 has 4 nucleons (two protons and two neutrons)

 

An element is defined by the number of protons. When there is a proton/neutron imbalance it is usually refered to as an isotope of that element.

 

Isotopes are elements with a differing number of neutrons. No "imbalance" necessary. Most stable isotopes with Z>20 have more neutrons than protons. Nuclei with Z=N are isotopes, too.

Note the careful use of the word usually. While I applaud your scientific accuracy(as I am the same) I kept the post simple given the calibre of the question.

Thank you for your help everybody

[posted in the from thread! mod can delete this post]