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#### Why in case of moving electrons quantum mechanics is used, while for moving cars we use newtonian mechanics?

#### Write down the crieria for aromaticity.

#### From one dimensional poisson's equation for electric field E. Obtain th expression for E in the region of schottky diode?

#### The following specifications are given for the dual input, balanced-output differential amplifier of Fig. 1(b): R_{c} = 2.2k*Omega R_{E} = 4.7k*Omega R S1 =R S2 = 50Omega ,+V CC =10V,-V EE = 10V. beta dc =100 and V theta*E =0.715V. Determine the operating points of the two
transistors

#### For which condition metal-semiconductor junction behaves as
i)ohmic contact
ii) rectifying contact
With E-k diagram, explain why LED emits light but PN junction rectifier diode doesn't