Engineering Materials in EE
Why diamond is very hard ?

 Because of covalent solid
 Because of large cohesive energy
 Because of high melting point
None of these

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Engineering Materials in EE
The Bohr model of the atom

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

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