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Shweta Thakur posted an Question

July 05, 2020 • 01:39 am

30 points

IIT JAM
Chemistry (CY)

Plz explain last three points... e imaginary tne imaginary axe tica, the theoretical ty (p)

e imaginary tne imaginary axe tical Density: nowing the age occupancy Pexp x 100 Pcals B cosy + 2cos a cos ß cos y) u=B = y = 90 V abc.

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Priyanshu kumar Best Answer

see this, this is mathematical derivation...so you have to learn this..
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hope you get shweta
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Priyanshu kumar

this is mathematical derivation...in cell volume V(cubed) =abc(1- alpha..... given alpha =beta=gamma=90° so cos 90°=0 so you proceed
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Lingareddy 1

for cubic crystal all angeles should be 90 degrees
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Shweta thakur

sir why v =abc ( 1-cos alpha ------
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Lingareddy 1

so all cos terms zero so V=abc(1)
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Lingareddy 1

cos 90=0
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sir why v =ABC (1-cos alpha ------------
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as written in book which formula they are using
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send full page
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this is full page which I have sent u
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just it is mathematical expression .from here they wrote directly
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From trigonometry equation cos2alpha + cos2beta -+cos2gamma -1=2 cosalpha cosbeta cosgamma)
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