How can we increase the kinetic energy of electrons emitted from the surface of a metal?
How can we increase the kinetic energy of electrons emitted from the surface of a metal?
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Transcribed Image Text: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 excited
germanium atom, drops into second excited state and then to first state, if the nucleus charge
is 4.8X10 C.
Q.3: Find the fraction of the face centered cubic unit cell volume filled with hard spheres as
shown 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 doping
concentration in the p-side is (10 m and 10" m), life time for holes-10 us, and hole
diffusion length is 1.5*10 m. Calculate the total conductivity in p-region.
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