Solve any five questionQ.1(a,b,c,d,e,f,g)

1(a)
Why the X-rays are preferred to study crystalline solids?

3 M

1(b)
Draw the following. (1 2 3), [1 2 3], (0 12)

3 M

1(c)
Write APF values for SC, BCC and FCC.

3 M

1(d)
Write Fermi-Dirac Distribution function and also mention the meaning of all the terms used over there.

3 M

1(e)
Explain the concept of Holes in semiconductor.

3 M

1(f)
Describe Inverse Piezo Electric effect.

3 M

1(g)
Write three important characteristics of soft magnetic material.

3 M

2(a)
Show that for instrinsic semiconductor Fermi level is located at the centre of forbidden energy gap. What is the probability of an electron being thermally excited at 27°C for a soild with band gap of 5.6eV. Take K=1.38×10

^{-23}J/K
8 M

2(b)
Find the following for Diamond cubic crystal sructure i) Atomic radius ii) Number of atoms per unit cell iii) Volume of unit cell. Hence determine its APF.

7 M

3(a)
State and derive Bragg's law X-ray diffraction. Calculate the galncing angle of rock salt having d=147 A°.Consider first order diffraction and wavelength of x-ray as a 1.541A°.

8 M

3(b)
A metal ring having cross sectional area 5cm

^{2}turns wound over it. Determine the current required to produce flux of 2 milliweber when i) No airgap ii) Air gap of 1 mm. In both the cases consider relative permeability of metal as 380.
7 M

4(a)
Draw the diagram representing molecular arrangement of different phases for liquid crystal. State any two aplications of liquid crystal.

5 M

4(b)
Mention different types of polarizability in dielectric. Explain electronic polarizability.

5 M

4(c)
The resistivity of intrinstic semiconductor is 2×10

^{-4}Ω.cm. If the mobility of electron is 6m^{2}/V-sec, and that of hole is 0.2m^{2}/V-sec, Calculate its intrinsic carrier density.
5 M

5(a)
Explain with neat diagram construction and function of solar cell.

5 M

5(b)
The volume of a room is 600m

^{3}. The wall area of the room is 220m^{2}. The floor and ceiling area is same and is gien as 120m^{2}. The average floor is 0.06. Calculate the average sound absorption coefficient and reverberation time.
5 M

5(c)
Derive critical radious ration for ligancy 6.

5 M

6(a)
Explain Magnetostriction Oscillator to produce Ultrasonic waves.

5 M

6(b)
Explain the formation of barrier potential in pn junction.

5 M

6(c)
Explain Ohm's law for magnetic circuit. Also write two points as its comparision with Ohm's law for electrical circuit.

5 M

More question papers from Applied Physics 1