Which of the following might best explain the reason why electrons are restricted to certain energy levels in an atom?
A. They are travelling at very high speeds.
B. They behave like restricted waves and are self-reinforcing.
C. They are interacting with the light around the atom.
D. They are out of phase and self-destruct when outside of distinct energy regions.
E. They behave like chaotic waves of alternating frequency.
Answer: B
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Consider massive gliders that slide friction-free along a horizontal air track. Glider A has a mass of 1 kg, a speed of 1 m/s, and collides with glider B, which has a mass of 5 kg and is at rest
If they stick upon collision, their speed after collision will be A) 1/4 m/s. B) 1/5 m/s. C) 1/6 m/s. D) 1 m/s. E) none of the above
In the figure below, a tectonic terrane is shown at
A. ocean plateau. B. linear island chain. C. continental fragment. D. island arc. E. All of these.
Why are there tremendous amounts of erosion when it rains in a desert?
What will be an ideal response?
Part of the reason for the lack of good flood control in the United States is that ________.
- sufficient funding is actually present, but the groups to carry out the work are too small - there has been no long-term planning that showed a need for flood control - there is no use spending money for something we cannot control anyway - government spending priorities have shifted, and flood control funds have been cut - money has been tight, and government spending overall has been reduced