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 Form 4 Physics Photoelectric Effect Questions and Answers

In figure 18, ultra-violet (u.v) light falls on a zinc plate placed on a charged leaf electroscope. It is observed that the leaf collapses.
figphotoelectric3620201512.JPG
Explain how this observation may be used to determine
the type of charge on the electroscope.

 (1m 44s)
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