The source of electrons in a common electric circuit is
A. a generator at the power station.
B. usually a wall socket.
C. a dry cell, wet cell, or battery.
D. the electric conductor itself.
Answer: D
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How might the spectrum of an atom appear if its electrons were not restricted to particular energy levels?
A. There would be no frequencies within the visible portion of the electromagnetic spectrum. B. A broad spectrum of all colors would be observed. C. It would appear nearly the same as it does with the energy level restrictions. D. The frequency of the spectral lines would change with temperature.
Hosni Mubarak was overthrown as the leader of which nation in 2011?
A) Egypt B) Libya C) Iraq D) Turkey E) Iran
What is the process that changes compacted sediment into a rock?
- Crystallization
- Lithification
- Metamorphism
- Weathering
There are about 3.5 million homeless people in the United States currently. About how many homeless people are there in Washington, D.C?
A) 3,000 B) 14,000 C) 60,000 D) 100,000