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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Nargis Sultana posted an Question
June 05, 2021 • 00:55 am
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30 points
30 points
- CSIR NET
- Physical Sciences
A. a linear diatomic lattice of lattice
answer is given option C ..but B is also incorrect right? cz, the max freq of acoustic branch is √(2C/M).. i am confused..plz help
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Bidyut sinha![best-answer]()
I have given detail logic in the Attached picture.please check it.. Incorrect option is B.. Because for acoustic branch , frequency is dependent on HEAVIER MASS.
yes that's the same logic i applied... but option c is also right answer , isn't it? because optical branch have higher frequency than that of acoustical .. am i right?
in the Option C it's written that dispersion of frequency in optical branch is smaller than that in acoustic branch.. it's written in the option c.But logically ,in acoustic branch ,for dispersion relation frequency is inversly proportional to square root of Heavier mass.Now as in denominator Heavier mass is there..So for Acoustic branch, frequency is smaller than Optical branch.
yes you are right...Now I got what you are saying...