**BE (1st Semester)**

**Examination, Nov-Dec 2007**

**Applied Physics-II**

**Unit-I**

Q1 (a) Can interferefringes be produced by two separate lighted;

candles or electric bulbs? Explain.

(b) Obtain an experession for the focal length of a combination of two thin co-axial lenses d cm apart.

(c) Two thin convex lenses having focal length 5 cm and 2 cm are co-axial and separated by a distance of 3 cm. Find the equivalent focal length and the position of the principal points

or

(a) Is it possible to get a diffraction pattern to a wide slit?

(b) Give the theory of Newton’s rings and describe a method of producing them. Explain how this phenomenon can be used to determine radiuS’Of curvature of a plano-convex lens.

(c) A plane transmission grating bas 40,000 lines per cm.These ruling are studied with an oil immersion microscope with light of wavelehgth 4000 A’ Calculate the numerical aperature microscope required to just re-solve the rulings.

**Unit-II**

Q2 ( a) When a photon strikes p tightly bound electron? What is the effect on the Compton shift?

(b) What do you understand by dual;nature of matter ?Explain de-Brog’lie hypdihesis. Describe and explain Davison and Germer experiment for the confirmation of above hypothesis.

(c) An electron has a speed of 600 m/s with an accuracy of 0.005% Calculate the certainty within which we can locate the position of the electron given that h=6.6xio~^{34} Joule-sec, m=9.1xl0~^{31} kg.

or

(a) How will you control the intensity and quality of X-ray?

(b) Explain and deduce Bragg’s law in X-ray diffraction.Describe a Bragg’s spectrometer. Explain how it is used to determine the wavelength of X-ray?

(c) X-ray of 1.0 A are scattered from a carbon block. Find the wavelength of the scattered beam in a direction making 900 with the incident beam. How much kinetic energy is imparted to the recoiling electron?(h= 6.63 xio^{-34} Joule-sec, 0=3.0×10® m/sec lev= 1.6×10 ^{19} Joule).

**Unit-III**

Q3(a) Substract (3 A8)_{16} from (B74)16

(b) Explain Exclusive-OR gate with logic diagram logic expression and truth table.

(c) Do as directed :

(i)” Convert (85.25)10 to Binary.

(ii) Convert (37.25)_{10 to } Octal.

(iii) Multiply (I I Ol)_{2}and(lOl)_{2} .

(iv) Add (7F)_{16}and(BA)_{16}

(i) Find 2’s complement at 1011.

(i) (BA)_{16}To Octal.

(i) (725)_{8}To decimal.

or

(a) Prove the Boolean Identity: (A+B).(A+C)=A+B.C.

(b) Why NAND and NOR gates are called universal gates

(c) Find, the Boolean expression for the D at output in

figure, (a) & (b) andiSnd its value if :

A=1, B=1, C=1.

A=1, B=1, C=0.

And find Bolean expression for E at output in tig.(c)

and find its value if A=B=C 1 and D=0.

**Unit-IV**

4. (a) Write the definition of Temporal & spatial coherence of light wave

(b) Explain the construction & working of He-Ne laser.

(c) Explain why two level pumping is not suitable forobt lining population inversion?

or

(a) Define step index and graded index fiber.

(c) Derive the expression for numerical aperature of step fiber. Write the expression for numerical aperature in te retructive index change.

(c) A step index fiber is made with a core of index 1.52, a diameter of 29 jim and a fractional difference indix of 0.0007. It is operated at a wave length of 1.3nm. Find the fiber V-number & the number of made the fiber wall support

**Unit-V**

5. (a) Write down any two difference between crystalline and amorphous solids.

(b) What is hall effect? Give expression for each of the following:

(i) Hall coefficient.

(ii) Hall voltage.

(iii) Hall angle.

(v) Hall mobility.

Mention some applications of Hall effect.

(c) What is atomic radius? Calculate the atomic radius for sipiple cubic structure & body centred cubic structure.

or

(a) Explain the procedure for finding ‘Mille