Question

Suppose you were trying to demonstrate the photoelectric effect. Which substances should MOST LIKELY be used?

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Neon (Ne #10)


Copper (Cu # 29)


Oxygen (O #8)

Answer 1

Copper. The photoelectric effect is demonstrated by shining light on a metal surface and ejecting electrons. Neon (a noble gas) and oxygen are gases (and have high ionization energies), so a metal like Cu is the appropriate choice.