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A multimode, step-profile fibre has a core radius of 50 microns, a core index of 1.52 and a cladding index of 1.50.
(a) If the fibre end-face is excited by a source with a wavelength of 850nm, what is the maximum number of bound modes that can be excited?
(b) What is the minimum number of bound modes that will be excited regardless of the wavelength of the source?
(c) If the fibre in (a) is now illuminated simultaneously by 2 sources that emit light at wavelengths of 1,300 and 1,550nm, respectively, what is the total number of different modal states that can be excited?
Suppose that the x rays are emitted from a focal spot isotropically. The photon flux is 3.28 x 10 6 photons mm -2 sec -1 at a distance of 0.75 m from the focal spot. What is the
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A laser beam from 200 watt source is focused on an area of 10 -8 m 2 . Determine the magnitude of the Pointing vector of the area.
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A cylindrical metallic wire is stretched to enhance its length by 5%. Measure the percentage change in its resistance.
Question Put the different types of light in order from lowest frequency to highest frequency. Feedback: These are all instances of electromagnetic radiation. Elect
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