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chapter 12 i-clicker question

chapter 12 i-clicker question - A Core cools off B Core...

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Where do the elements heavier than hydrogen and helium come from? A. The big bang B. Fusion reactions in stars and supernovae C. Reactions in interstellar gas and dust What are the most important properties of a star? A. Mass and age B. Age and chemical abundance C. Location in the galaxy and distance from Earth D. Luminosity and age What do we mean by a star in gravitational equilibrium? The outward push of pressure balances the inward pull of gravity What do we mean by a star in energetic (energy) equilibrium ? Energy generated at the core is released from the photosphere Why don’t gas clouds with less than 0.08 Msun of matter become stars? A. Something stops contraction before fusion starts B. Fusion energy can’t escape the core C. The atoms start to touch Gas pressure goes up as temperature rise What happen when a star can no longer fuse hydrogen to helium in its core?
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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...
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