Engineering Materials in EE
Permittivity of free space is equal to

 8.854 × 10 - 10 F / m.
 8.854 × 10 - 11 F / m.
 8.854 × 10 - 12 F / m.
 8.854 × 10 - 13 F / m.

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Engineering Materials in EE
The Bohr model of the atom

All of these
 could not explain the line spectrum of atoms larger than hydrogen.
 had some made-up rules without explanations.
 explained the color lines in the hydrogen spectrum.

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