Solve any one question from Q.1(a,b,c) Q.2(a,b,c)

1(a)
A thin film of uniform thickness is illuminated by monochromatic light. Derive an expression for path difference for the reflected rays system. Hence obtain the conditions for constructive and destructive interference.

6 M

1(b)
What is reverbration time? Explain any two measures to control reverberation time in an auditorium.

3 M

1(c)
Calculate the reverberation time for an empty hall of volume 1200m

^{3}that has total sound absorption of 450m^{2}sabine. When the hall is completely occupied, total sound absorption is further increased by 450m^{2}sabine. Hence calculate the reverberation time.
3 M

2(a)
What is piezoelectric effects? Draw neat and labelled diagram for piezoelectric oscillator and hence explain its construction and working.

6 M

2(b)
What is diffractionof light? Differentiate between Fresnel and Fraunhoffer diffraction( two points).

3 M

2(c)
A monchromatic light of wavelength 5500 A° incident normally on a slit of width 2×10

^{-4}cm. Calculate the angular position of first and second minimum.
3 M

Solve any one question from Q.3(a,b,c) Q.4(a,b,c)

3(a)
Why is the combination of Helium and Neon gases chosen in He-Ne laser system? Explain construction and working of He-Ne laser system with the help of energy level diagram.

6 M

3(b)
Define Fermi level for a semiconductor . Draw a neat and labelled diagram showing position of Fermi level in intrinsic semiconductor and in N-type semiconductor.

3 M

3(c)
A sample of inrinsic germanimum at room temperature has a carrier concentration 4.41×10

(Given: μ

^{22}cm^{3}, Donor impurity is added in the ratio 1 donor atom per 10^{epsilon;}atoms /cm^{3}of germanium. Determine the resistivity of the material thus formed.(Given: μ

_{e}3800 cm^{2}/V.s)
3 M

4(a)
What is Hall effect? Derive the expression for Hall voltage and Hall coefficient. State applications of Hall effect.

6 M

4(b)
What is double refraction? Draw neat and labelled diagram ( either for positive or negative crystal) showing propagation of light within a doubly refracting crystal when optic axis is: i) parallel to crystal surface

ii) perpendicular to crystal surface.

ii) perpendicular to crystal surface.

3 M

4(c)
Sugar solution is kept in a 20 cm long tube. When plane polarized light is passed through this solution, its plane of polarization is rotated by 10°. If the concentration of sugar solution is 0.07575, calculate the specific rotation of sugar.

3 M

Solve any one question from Q.5(a,b,c) Q.6(a,b,c)

5(a)
Deduce Schrodinger's time independent wave equation.

6 M

5(b)
What is de-Broglie hypothesis. Derive an expression for de-Brogile wavelength for an electron when it is accelerated by potential difference 'V'.

4 M

5(c)
Calculate the energy (in eV) with which a proton has to acquire de-Brogile wavelength of 0.1A°.

3 M

6(a)
State and explain Heisenberg's uncertainty principle. IIIustrate the principle by electron diffration at a single slit.

6 M

6(b)
Explain physical significance of wave function ψ and (ψ)

^{2}. State the mathematical conditions that wave function ψ should satisfy.
4 M

6(c)
A neutron is trapped in an infinite potential well of width 1A°. Calculate the vallues of enegy and momentum in its ground state.

3 M

Solve any one question from Q.7(a,b,c) Q.8(a,b,c)

7(a)
Explain critical magnetic field or superconductor. Differentiate between type-I and type-II superconductors (four points).

6 M

7(b)
With necessary diagram, explain physical method for synthesis of nanoparticles.

4 M

7(c)
State applications of nano-particles. Explain any one application.

3 M

8(a)
What is nanotechnology? Explain optical and electrical properties of nano-particles.

6 M

8(b)
Explain Meissner effect and show that supercondutors exhibit perfect diamagnetism.

4 M

8(c)
State applications of superconductors. Explain any one application.

3 M

More question papers from Engineering Physics