Lecture 4

Lecture 4 - 5 Thermal equilibrium the heat produced from...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
The Sun Tuesday, February 02, 2010 1:47 PM 1. How do we test models of the sun's core? o The sun is a huge glowing ball of gas- basically 3 layers Core: 16,000,000 K: very very hot and dense Convective zone Radioactive zone o The sun produces gamma rays and neutrinos 2. Solar neutrinos o Very small o Like "ghosts"- go through things like they aren't there, have very low reactions with things o Most pass straight of the sun as if it weren't there o 3 types: electron, muon, and tau Possible explanation for mis-calculations: perhaps the neutrinos change types? 3. Compared to the energy produced in the core of the sun, the surface emits o Less energy o The same amount of energy o More energy 4. Solar granulation o Each "little" granule is about the size of Texas o They are large bubbles rising to the surface, like a boiling pot
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 5. Thermal equilibrium: the heat produced from the core is the same as the heat coming from the surface 6. Density of the Sun o The core is much more dense than the outer layers o Density of the corona is about equal to a really good vacuum 7. An imaginary star, Alpha Fictionis is 3x as hot as the Sun. What color would you expect it to appear? o Blue/white o Yellow/white o Orange/red 8. How many times more energy does it radiate (same mass and radius, just 3x as hot) o The same amount o 3x o 9x o 27x o 81x 9. If the Sun has a total lifetime around 10 billion years, how long would you expect Alpha Fictionis to live, to the nearest power of ten? o 100 million years o 1 billion years o 10 billion years o 100 billion years o 1000 billion years...
View Full Document

{[ snackBarMessage ]}

Page1 / 2

Lecture 4 - 5 Thermal equilibrium the heat produced from...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online