Download AKTU B-Tech 1st Sem 2015-2016 ENGINEERING PHYSICS I AS 102 Question Paper

SECTION-A

1. Attempt all parts. All parts carry equal marks. Write answer of each part in short. (2x10=20)
   1. What is non-inertial frame of reference?

   --- Content provided by FirstRanker.com ---

   2. What is massless particle?
   3. Write the main condition for sustained interference.
   4. Show the intensity ratio of mass I/I for resolution limit.
   5. What is resolving power of grating?
   6. What do you mean by optic axis?

   --- Content provided by‌ FirstRanker.com ---

SECTION-B

Attempt any five questions from this section: (10x5=50)

2. What was the objective of conducting the Michelson-Morley experiment? Describe the experiment. How is the negative result of the experiment interpreted?
3. What is proper length? Derive the expression for it. Calculate the percentage contraction of a rod moving with speed 0.8c in direction inclined at 60° of its own length.
4. Explain the formation of interference fringes by means of a Fresnel's biprism and derive the expression for the fringe width. In a biprism experiment, the distance between the slit and the screen is 180 cm. The biprism 60 cm away from the slit and its refractive index is 1.5. When a source of wavelength 5890Å is used, the fringe width is found to be 0.012 cm. Find the angle between the two refracting surface of the biprism.

--- Content provided by⁠ FirstRanker.com ---

5. Describe the principle and working of Ruby laser system. Compare it with He-Ne-laser.
6. Discuss the phenomena of attenuation and dispersion in optical fibre.
7. What is holography? Explain the principle of holography using construction and reconstruction of images.

SECTION-C

Attempt any two questions from this section: (15x2=30)

10. 1. Show that the relativistic invariance of the law of conservation of momentum leads to the concept of variation of mass with velocity.

    --- Content provided by‍ FirstRanker.com ---

    2. What do you understand by missing order spectrum? What particular spectra would be absent if the width of transparencies twice of opacites?
    3. Two plane glass surfaces in contact along one edge are separated at the opposite edge by a thin wire. If 25 interference fringes are observed between these edges in sodium light of wavelength A = 5898Å of normal incidence, then find the thickness of the wire.
11. 1. Discuss construction and working of Nicol prism.
    2. What are Einstein's coefficients of emission? Establish relation between them.

    --- Content provided by‍ FirstRanker.com ---

    3. Determine core radius necessary for single mode operation at 0.85µm of step index fibre with µ1 = 1.485 and µ2= 1.479. What are the numerical

Planck's Constant, h = 6.63 x 10-34 J/s

Charge on electron, e = 1.6 x 10-19 ?

Boltzmann's Constant,k = 1.38 x 10-23 m2kgs-2K-1

--- Content provided by​ FirstRanker.com ---

For more papers visit: FirstRanker.com