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what is the expression for the Rydberg's...

what is the expression for the Rydberg's constant ? Give the meaning of the symbols.

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`R=(me^(4))/(8epsilon_(0)^(2)ch^(3))` where m - mass of the electron, e charge on the electrons, c - speed of light , and h - Planck's constant and `epsilon_(0)` - absolute permittivity of the free space.
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