102 PHYSICS

MODEL EXAMINATION –APRIL 2007

ENGINEERING PHYSICS

Time:3Hrs Max marks:100

PART A

1. What is the difference b/w interference & diffraction of light?

2. For a plane diffraction grating with 5000 lines per cm used at normal incidence.

1.What is the largest wavelength of light for which a spectrum can be observed?

2. For wave length of 6000 angstrom what is the highest order of the spectrum that

can be observed?

3. What is packing factor& unit cell?

4. Explain the principle of holography.

5. State& explain Heisenberg’s uncertainty principle.

6. Explain Vector atom model & its concepts.

7. What is dispersive power of a grating? Obtain an expression for dispersive power.

8. Calculate the thickness of a quarter wave plate for light of wavelength 5896 angstrom.

The refractive indices for ordinary & extra ordinary rays being 1.54& 1.55

respectively.

PART B

9. Describe the theory , construction & working of Michelson’s interferometer .How can

it used to measure length?

OR

10. What is optical activity ? Explain Laurent’s half shade polarimeter.

11. Outline the principle & working of He- Ne laser? What is stimulated emission? How

does it differ from spontaneous emission?

OR

12. What is the principle of optic fibre?

13. Derive the Schrondinger time independent equation.

OR