Which of the following is not matter?

a. Air
b. Heat
c. Charcoal
d. Electrons

b

Physics & Space Science

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The observed acceleration of the expansion of the Universe is evidence that some form of energy, either a cosmological constant or quintessence, is spread throughout space

Indicate whether the statement is true or false

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Physics & Space Science

Diamond, graphite, and buckyballs are

a. isotopes. b. allotropes. c. isomeres. d. diatomic.

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Physics & Space Science

Use the band theory of semiconductors to choose the most correct statement below

a. A semiconductor primarily differs from an insulator in size of band gap. b.Materials that are generally called conductors contain an overlap in the conduction and valence bands. c. Conductors and semimetals are similar in band structure because of large band gaps. d. Electrons in insulators at room temperature can easily cross the band gaps. e. Semimetal materials are arranged structurally like metals but act as insulators because they have large band gaps.

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Physics & Space Science

High voltages are desirable for long distance transmission of electric power because

A. the higher the voltage the higher the current, which reduces the power lost B. the higher the voltage, the lower the current, which reduces the power lost C. the higher the voltage the less concern there is for safety

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Physics & Space Science