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An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be:
(1) 26
(2) 30
(3) 36
(4)56
Ans: (b)30
A medium is characterised by relative permittivity ε r =45 and relative permeability μ r =5. Determine the speed of e-m wave in the refractive and medium index of the medium.
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