Why is the production of iron important for understanding the explosion of massive stars?
What will be an ideal response?
Iron nuclei do not produce energy when they fuse, so iron cannot support the weight of the star, or produce heavier elements. The production of iron removes support for the outer layers of the star, causing the core to collapse.
You might also like to view...
At absolute zero
A. all molecular motion is ceasing B. the pressure of an ideal gas is zero C. the volume of an ideal gas is zero D. the Celsius temperature is zero
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
A. Y has a negative charge. B. Z has a negative charge. C. Y has a positive charge. D. Z is neutral (has no net charge). E. Y is negatively charged or neutral (has no net charge).
When the magnitude of the charge on each plate of an air-filled capacitor is 4 ?C, the potential difference between the plates is 80 V. What is the capacitance of this capacitor?
A) 0.1 µF B) 50 µF C) 100 µF D) 20 µF E) 50 nF
If two identical planets, each with surface gravity g and volume V, coalesce into one planet with volume 2V, the surface gravity of the new planet is 2g
1.True 2.False