Q.1: Solve all of the following with short answers:1. How can we increase the kinetic energy of electrons emitted from the surface of a metal?2. In which part of the wave is the electron most probability?3. What is the umber of electrons in the sixth secondary orbital?4. If the potential energy of the electron equal -4.3eV, what is its mass?0.2: Calculate the shortest wavelength for electron revolving in the fourth excitedgermanium atom, drops into second excited state and then to first state, if the nucleus chargeis 4.8X10 C.Q.3: Find the fraction of the face centered cubic unit cell volume filled with hard spheres asshown in figure below if the total volume of cell (cubic) is 729 cm.Q.4:A p-n Junction has electron mobility 0.13 m'v's', themal velocity is 30 mV, the dopingconcentration in the p-side is (10 m and 10" m), life time for holes-10 us, and holediffusion length is 1.5*10 m. Calculate the total conductivity in p-region.

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