University of Mumbai 2005 B.Sc General Applied Science II - Question Paper

MUMBAI UNIVERSITY

Applied Science II
November 2005 (Revised Course)


part I - (Marks: 50)

N.B. (1) ques. No. one is compulsory.

(2) ans any 4 ques. from remaining 6 ques..

(3) presume suitable data whenever needed.

(4) Figures to the right indicate full marks.

(5) Illustrate your ans with sketches wherever necessary.


1. (a) compute the lowest width that grating must have to resolve the components of Sodium D
lines in the 2nd order, the grating having 1000 lines/cm. D1 = 5896 A° and D2 = 5890 A°. (5)

(b) In Newton's rings experiment, the diameter of a certain bright ring is 0.65 cm and that
of 10th ring beyond it is 0.95 cm. If wavelength of the source used is 6000 A°,
compute the radius of curvature of a convex lens surface in contact with the glass plate. (5)

2 (a) define the process of obtaining a 3 dimensional image by the holography method. .(5)

(b) When a slow neutron is captured by U235 nucleus, fission outcomes in the release of 200 MeV energy.
If the output power of a nuclear reactor is 1.6 mW, compute the number of Nuclei undergoing
fission per sec. .(5)

3. (a) explain the phenomenon of Fraunhofer diffraction at single slit and find condition for
first minimum in the trend. .(5)

(b) In thermonuclear reaction 1.09 x 10 -3 kg of hydrogen is converted in to 0-983 x 10 -3 kg of helium. .(5)
(i) compute energy released in joules.
(ii) If the efficiency of the generator is 5%, compute the electrical energy output in kWH.

4. (a) Derive the expression for Numerical Aperature for fibre optics cable.
What do you understand by acceptance angle and what is it's significance ? .(5)

(b) If the p.d. applied across an X-ray tube is 25 kV and current through is 10 mA,
compute no. of electrons striking the target per 2nd and minimum
wavelength limit for the X-ray generated. .(5)


5. Write short note on (any two): 10

(a) G.M.Tube (c) Nuclear Chain Reaction.
(£) Mass defect and binding energy

6. (a) A wedge-shaped airjilm, having an angle of 45 seconds, is illuminated by monochromatic
light and fringes are observed vertically through a microscope. The distance measured
ranging from the consecutive film is 0.12 cm. compute the wavelength of light used. 5

(b) The atomic mass of 8016 is 16 a.m.u. obtain out binding energy per nucleon. 5

Earning:   Approval pending.