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The manifestation of band structure in s...

The manifestation of band structure in solids is due to

A

(a)Heisenberg's uncertainty principle

B

(b)Pauli's exclusion principle

C

(c)Bohr's correspondence principle

D

(d)Boltzmann's law

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The correct Answer is:
B
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Light guidance in an optical fiber can be understood by considering a structure comprising of thin solid glass cylinder of refractive index n_(1) surrounded by a medium of lower refractive index n_(2) . The light guidance in the structure takes place due to successive total internal reflections at the interface of the media n_(1) and n_(2) as shown in the figure . all rays with the angle of incidence i less than a particular value of i_(m) are confined in the medium of refractive index n_(1) . The numerical aperture (NA) of the structure is defined as "sin"i_(m) If two structures of same cross - sectional area, but different numerical apertures NA_(1) and NA_(2)(NA_(2) lt NA_(1)) are joined longitudinally , the number aperture of the combined structure is

ALLEN -SIMPLE HARMONIC MOTION-Exercise-04 [B]
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  5. Which of the following transitions in hydrogen atoms emit photons of h...

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  6. Suppose an electron is attracted towards the origin by a force (k)/(r ...

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  7. The transtion from the state n = 4 to n = 3 in a hydrogen like atom r...

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  8. Energy required for the electron excitation in Li^(+2) from the first ...

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  9. Hydrogen atom is excited from ground state to another state with princ...

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  11. In a hydrogen like atom electron make transition from an energy level ...

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  12. Hydrogen (""(1)H^(1)), Deuterium (""(1)H^(2)), single ionised Helium (...

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  15. Formation of covalent bonds in compounds exhibits …….nature.

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