Download SGBAU B-Tech 2nd Sem Chemical Engineering Applied Physics II Question Paper

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B.E./ B.Tech. (Chemical Engineering) First Semester
Applied Physics - II

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Notes:

1. All questions carry equal marks.

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2. Due credit will be given to neatness and adequate dimensions.
3. Assume suitable data wherever necessary.
4. Use of pen Blue/Black ink/refill only for writing the answer book.

1. a) Obtain an expression for energy of an electron in n^th orbit of Bohr's atom. 4
   b) State and explain two important concepts of vector atom model. 4
   

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   c) Enlist and describe all seven quantum numbers. 3
   d) The wavelength of the first member of the Balmer series in hydrogen spectrum is 6563 A°. 3
   Calculate the wavelength of the first member of Lyman series in the same spectrum.
   OR
2. a) Draw an energy level diagram for hydrogen atom and explain spectral series of hydrogen atom. 5
   

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   b) Describe Frank-Hertz experiment to prove the existence of discrete energy states for electrons in atoms. 5
   c) What is wave packet? Give physical significance of wave function Ψ. 4
3. a) Explain the principle and working of cyclotron. 5
   b) Draw the block diagram of CRO. 3
   c) Derive an expression for vertical deflection Y of electron beam in transverse electric field. 3
   

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   d) Explain that electron travels parabolic path in transverse electric field. 2
   OR
4. a) Explain construction and working of Bainbridge Mass-Spectrograph. 5
   b) What is positive rays? State its properties. 3
   c) Explain motion of electron in crossed electric and magnetic fields. 3
   

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   d) The electron is passed through uniform magnetic field B =20x10^-4 Wb/m² follows a circular path. If orbital velocity of electron is 4.396x10⁷ m/sec. Calculate the radius of electron orbit.
5. a) Explain the formation of interference fringes due to thin film and obtain condition for bright fringe and dark fringe.
   b) How will you determine wavelength of sodium light by using Newton's ring expt.?
   c) What is wavelength of light that is deviated in first order through an angle 20° by transmission grating having 6000 Lines /cm?
   OR

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6. a) In Newton's ring experiment show that radius of dark ring is directly proportional to the root of number of rings.
   b) What is plane transmission grating? How it is prepared?
   c) In Newton's ring experiment the diameter of 20^th ring was found to be 0.59 cm and that of 10^th ring was 0.336 cm. If the radius of curvature of plano-convex lens is 1m; Calculate the wavelength of light used.

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