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In solid-state physics, the free electron model is a simple model for the behaviour of valence electrons in a crystal structure of a metallic solid. It was developed principally by Arnold Sommerfeld who combined the classical Drude model with quantum mechanical Fermi-Dirac statistics and hence it is also known as the DrudeSommerfeld model.
The free electron empty lattice approximation forms the basis of the band structure model known as nearly free electron model. Given its simplicity, it is surprisingly successful in explaining many experimental phenomena, especially
The WiedemannFranz law which relates electrical conductivity and thermal conductivity;
The temperature dependence of the electron heat capacity;
The shape of the electronic density of states;
The range of binding energy values;
Electrical conductivities;
Thermal electron emission and field electron emission from bulk metals.

Nowadays, you have got hoards of vocational courses to choose from after you are done with 10+2. Vocational training programs offer a great scope to inculcate the passion of students and use them productively in their career. A few vocational training programs are listed below:
1) Audio Engineering- It caters to the need of mixing, jamming, manipulating and reproducing sound for the new media including cyber games something which the youngsters just love to do and the job prospect in the industry is a massive boom in the television and cyber media industry. The colleges and institutions offering such courses are: FTII, SRFTI, Asian Academy of Film and Television, Sound Engineering Academy, IIT Kharagpur, and CRAFT.
2) Multimedia and Animation- You need to have certain expertise and knowledge about multimedia and animation so that you can virtually give life to the inanimate objects born out of your fancy. The institutes for this are you can go to Maya Academy of Advanced Cinematics, Toonz Academy, Zee Institute of Creative Arts, Amity Universe and Arena Animation
3) Game Designing -With the increasing demand of games and cyber sports, you can expect a high paid flourishing career as well. You can opt for a variety of such courses (mostly diplomas and PG Diplomas) at these institutesFraction and Frames, Picasso Animation College, DSK Supinfocom, Industrial Design Center (at IIT Bombay), etc.