Jaypee Institute of Information Technology (JIIT) 2008 B.E test 3 : physics 1 - Question Paper
JAYPEF, rMVEFSlTY OF INFORMATION TECHNOLOGY
waknaghat
TF.ST-3(NOV. 2008)
SEMESTER-!
COURSE CODE: 07BI1PH10I MAX. TIME: 1HRS 30 MIN
COl'RSE NAME: PHYSICS-1
COI RSE CREDIT: 04_MAX. MARKS: 30_
1. An X-ray photon hits a crystal, scattered photon when analyzed for various scattering angles give lines of wavelength other than the incident wavelength. Derive the expression for the change in wavelength in terms of scattering angle. (4)
2. Explain Ultraviolet Catastrophe. (2) MJsing Maxwell Boltzmann velocity distribution, for an assembly of an ideal gas show
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Out = /-. Symbols have their usual meaning. . (3)
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4. Using electronic distribution of copper <Z*29), find the Fermi energy of electrons if each atom contributes one free electron to the electron gas. The density of copper is 8.94x 105Ax/m5 and its atomic mass is 63.5 gm/mole. Avogadros number 6.02 X 1(P per mole. Plancks constant
6.63 X 10>4J.scc..k 1.38 X lOJK, mass of clcctron -9.1X I0 M kg. (3)
5. Explain the Icons 1) Stimulated emission; 2) Population inversion; 3) Optical Pumping (3)
6. Explain the working of He*Ne laser. (3)
7. An element is placed in a 0.30U Tesla magnetic Held and suitably excited. How tar a pan are the Zeeman components of the 450 nm spectral line of this element? (2)
8. Why an atomic state 2'Psa is impossible? (2)
. 9vtarting from Lorcntz transformation equations find the expression for length contraction, and time dilation. (4)
10. Whv the lens surfaces are coaled with antircflection coatings with thickness - where ft is the ....
refractive index of coating and A is the wavelength of incident light (2)
II. If the monochromatic light is incident on glass slab //2.30 such that reflected light is plane polarized. If the whole slab is placed in water33. what should be the angle of incident to get plane polarized light from glass slab? (2)
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