Notes covered in Exam2

Notes covered in Exam2 - Review Questions:-- What are stars...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Review Questions:-- What are stars doing while on the main sequence?-- What are the 3 ranges of stellar mass relevant for stellar evolution? What is the end product of a high mass star? Or a low mass star? Why does the mass of the star determine its end fate (I.e. what physical processes are at work?)-- can you describe conceptually what happens in the interior of a low mass star like the sun once it evolves off the main sequence? How come it develops an “onion-like” layered structure in its core?-- What are the corresponding stages in the HR diagram?-- why is iron the end product of stellar evolution? What is the Origin of Cosmic Rays? Astr 2340 Spring 2010 R. Chandar What is the origin of cosmic rays? • Discovery of Cosmic Rays • General properties of cosmic rays • Cosmic rays from the Sun • Accelerating Cosmic rays • Detecting cosmic rays Types of Radiation • We have discussed electromagnetic radiation, I.e. light – massless, travel at v=c • When scientists Frst started studying radiation in the early 1900s, they found 3 different types of rays – Alpha rays – turned out to be Helium nuclei (matter) – Beta rays – turned out to be electrons and positrons (matter) – Gamma rays – turned out to be light (not matter) • Detectors invented to study radiation included Geiger counters, Flm and electroscopes Discovery of Cosmic Rays • He was trying to Fnd the source of additional radiation seen at ground level that could not be explained by natural sources of radioactive decay Viktor Hess (1912) takes electroscope on a Viktor Hess (1912) takes electroscope on a balloon flight to 17,500 feet (without balloon flight to 17,500 feet (without oxygen!) oxygen!) Hess’ Experiment • Hess used an electroscope – detects charge on 2 thin flms • When the cosmic rays (charged particles) hit the electroscope, they carried away charge • More cosmic rays electroscope would discharge Faster • ¡ound that the number oF cosmic rays increased above ~1 km, and concluded that these were coming From outer space and not the earth • Hess won the Nobel prize in 1936 For his discovery oF cosmic rays What are cosmic rays?...
View Full Document

This note was uploaded on 02/21/2011 for the course ASTR 2340 taught by Professor Rupalichandar during the Spring '10 term at Toledo.

Page1 / 37

Notes covered in Exam2 - Review Questions:-- What are stars...

This preview shows document pages 1 - 8. Sign up to view the full document.

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