The evolution of a "high mass star" is different from the evolution of smaller stars because these stars ____
a. do not generate strong stellar winds
b. rotate faster
c. have stronger magnetic fields
d. can ignite carbon fusion
e. are never in binary systems
d
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Ice or compacted snow sublimes to a saturated vapor in cold climates. Estimate the rate at which ice will sublime per unit area on an iceberg if the ice is -30ºC and the air is - 10ºC. Assume a convective heat transfer coefficient of 20 W/m^2?K.
What will be an ideal response?
If you observe the night sky in the direction of the North Star, you will observe that
A) the other stars near the north star move along clockwise circles around the north star during the night. B) the north star moves westward across the sky during the night. C) the other stars near the north star move in straight lines from east to west during the night. D) the other stars near the north star move along counterclockwise circles around the north star during the night. E) the north star moves eastward across the sky during the night.
Why does a star grow larger in radius immediately after it exhausts its core hydrogen?
A) The outer layers of the star are no longer gravitationally attracted to the core. B) Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward. C) Helium fusion in the core generates enough thermal pressure to push the upper layers outward. D) Helium fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.
In a double-slit experiment, the intensity of light at the center of the central fringe is measured to be 6.2 × 10-6 W/ m2. What is the intensity halfway between the center of the fringe and the first dark band?
A) 6.2 × 10-6 W/ m2 B) 3.1 × 10-6 W/ m2 C) 4.7 × 10-6 W/ m2 D) 1.6 × 10-6 W/ m2 E) 0.12 × 10-6 W/ m2