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Engg. Physics 7 Marks Numerical questions
Engg. Physics 7 Marks Numerical PYQs questions
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Engineering Physics BAS 101/201 Singham श्रंखला Part 6 By Lalit Rathi Sir
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Q26. A step index fibre has μ1 =1.466 and μ2 = 1.46 where μ1 and μ2 are refractive indices of core and cladding respectively. If the operating wavelength of the rays is 0.85 μm and the diameter of the core = 50 μm, calculate the cut-off parameter and the number of modes which the fibre will support.
Q27. A silicon optical fibre with a core diameter large enough has a core refractive index of 1.50 and a cladding refractive index 1.47. Determine
(i) the critical angle at the core cladding interface,
(ii) the numerical aperture for the fibre
(iii) the acceptance angle in air for the fibre.
Q28. For a medium, conductivity σ = 58 x 10^6 seimen/m, εr =1. Find out the conduction and displacement current densities if the magnitude of electric field intensity is given by E = 150 sin (10^10 t) Volt/m.
Q29. A step index fiber has core refractive index 1.466, cladding refractive index 1.46. If the operating wavelength of the rays is 0.85 µm, calculate the cut - off parameter and the number of modes, which the fibre will support. The diameter of the core = 50 µm.
Q30. Compute the energy difference between the ground state & the first excited state for an electron in a one-dimensional rigid box of length 100 Å.
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