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# Check that the ratio $ke^2/G \;m_e \;m_p$ is dimensionless. Look up a Table of Physical Constants and determine the value of this ratio. What does the ratio signify?

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## 1 Answer

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$2.4 × 10^{39}$
This is the ratio of electric force to the gravitational force (at the same distance) between an electron and a proton.
Hence C is the correct answer.
answered Jun 4, 2014 by