False
Download Learnerz IAS app from the Play Store now! Download

$show=search/label/May%202022

 


Nucleosynthesis UPSC NOTE

 

  • Stellar nucleosynthesis is the process by which stars forge elements inside their cores.

  • The only element not formed in this way is hydrogen, the most abundant and lightest element in the universe: it was formed in the initial aftermath of the Big Bang.

  • The cores of stars have crushing pressures and temperature

  • For example, the sun’s core temperature is about 15 million degrees C. 

  • In these harsh conditions, the nuclei of atoms undergo nuclear fusion.

  • The hydrogen nucleus is just one proton

  • Inside the core, these nuclei come together to form helium nuclei (two protons and two neutrons). 

  • This is the p-p (short for proton-proton) process.

  • In more massive stars, however, stellar nucleosynthesis treads a different path — one dictated by the availability of energy. 

  • More massive stars have a higher core temperature

  • There, in the so-called carbon-nitrogen-oxygen (CNO) cycle, the nuclei of these elements come together in different ways to form elements from helium onwards.

  • When a star runs out of nuclei to fuse, its core contracts

  • This in return increases its temperature, triggering nuclear fusion yet again. 

  • This process goes back and forth until the star starts to produce iron in its core. 

  • Iron is the lightest element for which fusion consumes more energy than it releases

  • Elements heavier than iron can only be synthesised outside a star when it goes supernova.

COMMENTS

Name

Amritsar,1,April 2024,301,Art & Culture,1,August 2023,251,Courses,7,Daily Current Affairs,48,December 2023,189,Disaster Management,2,Environment and Ecology,154,February 2024,228,Foundation Course,1,GDP,1,GEMS Club,1,GEMS Plus,1,Geography,158,Govt Schemes,2,GS 2,1,GS1,6,GS2,41,GS3,16,GST,1,History,9,Home,3,IAS Booklist,1,Important News,71,Indian Economy,123,Indian History,4,Indian Polity,137,International Organisation,12,International Relations,108,Invasive Plant,1,January 2024,240,July 2023,281,June 2022,6,June 2023,268,June 2024,224,March 2024,238,May 2022,17,May 2024,330,Mentorship,2,November 2023,169,October 2023,203,Places in News,2,Science & Technology,75,Science and Technology,90,September 2023,205,UPSC CSE,111,
ltr
item
Learnerz IAS | Concept oriented UPSC Classes in Malayalam: Nucleosynthesis UPSC NOTE
Nucleosynthesis UPSC NOTE
Learnerz IAS | Concept oriented UPSC Classes in Malayalam
https://www.learnerz.in/2024/05/nucleosynthesis-upsc-note.html
https://www.learnerz.in/
https://www.learnerz.in/
https://www.learnerz.in/2024/05/nucleosynthesis-upsc-note.html
true
4761292069385420868
UTF-8
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS PREMIUM CONTENT IS LOCKED STEP 1: Share to a social network STEP 2: Click the link on your social network Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy Table of Content