Fill in the blancks

1.   Dual nature of matter waves was proposed by ________________

2.   Matter waves are also called as ____________

3.   Existence of matter waves was experimentally first demonstrated by ___________

4.   de Broglie wave length λ=_____________

5.   When a potential difference of 400 volts is applied in accelerating an electron, the wavelength attained by an electron is _____________

6.   One dimensional Schrodinger time independent wave equation is ____________

7.   According to ____________ principle, it is not possible to know position and momentum of a particle at same time.

8.   Quantum mechanics deals with ____________ properties of the materials.

9.   The emission of electrons from a metal plate, when illuminated by light or any other suitable radiation of wavelength is called ___________

10.  The stopping potential is _____________ of the intensity of incident radiation.

11.  Higher is the intensity of the incident radiation, ____________ is the saturation current.

12.  Different photo metals are having __________ threshold frequencies.

13.   ___________ happens to a high energy photon after it strikes an electron.

14.  Δx, Δp are the uncertainties of its position and momentum respectively, then these can be related as ____________

15.  Wave function of a particle in 1D potential box is __________.

Fill in the blancks

1.   ___________model proposed a simpler potential in the form of an array of square wells.

2.   The representation of permissible values of k of the electrons in one, two or three dimensions is known as _______________.

3.   In the Kronig Penny model the width of the allowed bands ----------- and the width of the forbidden band ___________with an increase of the energy αa.

4.   When an electron in a periodic potential of the lattice is accelerated by an electric field or magnetic field, then the mass of the electron is called ___________.

5.   First Brillouin zone corresponds to k value extending from _______to _________.

6.   Expression of electron effective mass m* =____________.

7.   In zone theory of solids, the potential is __________near the positive ions and ___________ in between the positive ions.

8.   The energy gap between the valance and conduction bands in an insulator is of the order of ________________.

9.   The periodicity of the potential of zone theory of solids is given by ____________ theorem.

10.  According to the Kronig-Penney model, the width of the allowed energy band increase with increasing _________.

11.  The semiconductors have a band structure similar to the insulator at __________Kelvin.

12.  The most commonly used semiconductor is _________.

13.  The “band gap” in semiconductor theory is defined as ___________.

14.  A vacant or partially filled band is called ______________.

15.  A completely filled band is called ______________.

16.  The energy band occupied by the valence electrons is called ______________.

17.  When the potential barrier strength becomes zero, then it leads to ______________.

Fill in the blancks

1.      At absolute 0 K, a semiconductor behaves as _______________________.

2.      With increase in temperature, the resistivity of a semiconductor ________________.

3.      In a pure semiconductor, the electrical conductivity is governed by the motion of ___________________.

4.      In comparison with an intrinsic semiconductor, the resistivity of an extrinsic semiconductor is ____________________.

5.      As the temperature of semiconductor increases, the probability to find an electron in the conduction band ____________________.

6.      Electrical resistivity of a pure semiconductor at absolute zero temperature is ____________.

7.      The electron vacancies in a valance band of a semiconductor will exist as ______________.

8.      Expression for Hall coefficient is equal to _______________________.

9.      To get p-type semiconductor ____________________elements are added to Si.

10.  The highest energy level of the filled energy state at 0K is called _____________________.

11.  _____________________is an example for intrinsic semiconductors.

12.  The effect which helps us in identifying the type of semiconductor is ___________________.

13.  When current carrying conductor is placed in a transverse uniform magnetic field, an electric field is produced in a direction normal to both the current and the magnetic field. This phenomenon is called _______________________.

14.  In an intrinsic semiconductor always __________________number of electrons and holes will present.

Fill in the blancks

1.      The pumping process that is used in He-Ne lasers source is __________________________.

2.      In He-Ne laser system, __________________ ions give metastable levels.

3.      He-Ne laser is a good example for a _____________level system.

4.      Wave length of emission of Nd-YAG laser is _______________.

5.      Resonator mirrors in a laser provide _______________ to the photons.

6.      Emission of photon when an electron jumps from higher energy state to lower energy state due to interaction with another photon is called___________________.

7.      Fiber optic communication is based on ________________ phenomenon.

8.      Refractive index of cladding has to be _____________than the refractive index of core.

9.      For total internal reflection to occur light must travel from ____________ to ____________ medium.

10.   Light launched at the fiber end within ______________ alone propagates to the other end.

11.   The maximum acceptance angle is called ___________________.

12.   In optical fibers attenuation is mainly due to two sources of losses namely __________ and __________________.

13.   Numerical aperture of the fiber is related to the acceptance angle by _________________.

14.   Inter model dispersion is negligible in _________________ fibers.

15.   Single mode fibers supports ____________________.

16.   Propagation of light through the fiber core is due to _________________________.

Fill in the blancks

1.      The process of producing electric dipoles which are oriented along the field direction is called _____________________ in dielectrics.

2.      The displacement of cations and anions in opposite direction in ionic solids result in _______________________polarization.

3.      Induced dipole moment per unit volume of the dielectric material is called ______________.

4.      The time taken for a polarization process to reach 1/e of its maximum value is called ______________________.

5.      The dipole moment per unit volume of the dielectric material is called _________________.

6.      Change in polarization per unit temperature change of the specimen is called __________________________.

7.      The process of producing electric dipoles which are oriented along the field direction is called______________________ in dielectrics.

8.      The property of becoming electrically polarized when mechanical stress is applied is known as _____________________.

9.      Clausius-Mosotti equation is ______________________.

10.   _________________ and __________________polarizations are dependent on temperature.

11.   __________________materials do not have permanent magnetic dipoles.

12.    One Bhor magneton equals to____________________.

13.   The unit of magnetic induction is _________________________.

14.   If the atoms of the material carry permanent dipoles and if they are line up in anti-parallel direction, then the material is _____________________.

15.   Area enclosed by the hysteresis loop represents_______________________.

16.   Soft magnetic materials have _________________hysteresis loss.

17.   Example of hard magnetic material is _____________________.

18.   Ferromagnetic materials consists of a number of small regions which are spontaneously magnetized is called ____________________.

19.   The lag of magnetization behind the magnetizing field in ferromagnetic materials is known as _______________________.

20.   ___________________________ is the example of ferromagnetic material.