A pencil has

A. no nuclei in it.
B. no electric charges in it.
C. enough positive charge in the nuclei to balance the negative charge of the electrons.
D. electrons that are not attracted to nuclei.


Answer: C

Physics & Space Science

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The emissivity of an ideal reflector has which of the following values?

a. 0 c. 100 b. 1 d. infinity

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