Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 27 - Early Quantum Theory and Models of the Atom - Problems - Page 799: 3

Answer

5 electrons.

Work Step by Step

The upward electric force balances the weight. The electric field is the potential difference divided by the plate separation. $$qE=ne\frac{V}{d}=mg$$ $$n=\frac{dmg}{eV}$$ $$n=\frac{(0.010m)(2.8\times10^{-15}kg)(9.80m/s^2)}{(1.60\times10^{-19}C)(340V)}$$ $$n=5$$
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