What happens to energy in the Sun's convection zone?
A) Energy is transported outward by the rising of hot plasma and sinking of cooler plasma.
B) Energy is produced in the convection zone by thermal radiation.
C) Energy slowly leaks outward through the radiative diffusion of photons that repeatedly bounce off ions and electrons.
D) Energy is produced in the convection zone by nuclear fusion.
A) Energy is transported outward by the rising of hot plasma and sinking of cooler plasma.
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How old is Earth, according to the vast majority of scientists?
A) a few thousand years B) about 100 billion years C) a few billion years D) about a billion years E) a few million years
What is the difference between a meteor and a meteorite?
A. A meteorite is a very tiny meteor. B. A meteor is the flash of light in the sky. A meteorite is the solid body ending up on the ground. C. A meteorite comes from a comet. A meteor comes from an asteroid. D. A meteorite is the flash of light in the sky. A meteor is the solid body ending up on the ground. E. A meteorite is the pit made on Earth or a planet when a meteor hits.
Which of the following types of data provide evidence that helps us understand the life tracks of low-mass stars?
A) H-R diagrams of globular clusters B) H-R diagrams of open clusters C) observing a low-mass star over many years D) spacecraft observations of the Sun
A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and comes back with half its original speed. What is the kinetic energy of this object at this point?
A) 2.0 J B) 1.0 J C) 0.50 J D) 0.25 J E) 4.0 J