This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: A. Core cools off B. Core shrink and heats up C. Core expands and heats up D. Helium fusion immediately begins Which two particles repel each other with the largest electromagnetic force? A. 2 hydrogen nuclei B. 2 helium nuclei C. 1 hydrogen nuclei, 1 helium nuclei What happens as a star’s inert helium core starts to shrink? A. Hydrogen starts to fuse in shell around core B. Helium fusion slowly begins C. Helium fusion rate rapidly rises D. Core pressure sharply drops What happens when the star’s core runs out of helium? A. The star explodes B. Carbon fusion begins C. The core cools off D. Helium fuses in a shell around the core Why doesn’t fusion happen in the carbon core of a low-mass star? A. It’s too hot B. Thermal pressure stops its contraction C. Degeneracy pressure stops its contraction...
View Full Document
- Fall '08
- helium fusion, C. Core, D. Helium fusion