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Shweta Thakur posted an Question

July 03, 2020 • 21:19 pm

30 points

IIT JAM
Chemistry (CY)

Sir plz tell me ... that why here bcc in(body diagonal ) ac =2a^2 plz look both images s =2xtr3=rr3 64r3 giguren28 8 b 8 r t3 t3 643 33 . fract

IGUREN28 8 B 68 8 Body-centred cubic unit cel1 or o occupied = 68%. Sizes of Tetrahedral and Octahedral Vo

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Dinesh khalmaniya 1

hope this will help you 🙏
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Dinesh khalmaniya 1 Best Answer

check this solution
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Suman Kumar

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.toppr.com/ask/question/relationship-between-atomic-radius-and-edge-length-a-of-a/&ved=2ahUKEwiN1dT8gLHqAhWSguYKHaXcDI8QFjACegQICRAB&usg=AOvVaw3nh7o9kwEAlM0MlpIZ9Adw
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See this
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Solid state needs little imagination.
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Priyanshu kumar

In the figure on your book AD is body diagonal...and is equal to 4r
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and in your figure the diagonal AC= root 2a and CD=a so you find by pythagoras theorem AD =root 3a and then proceed to find packing efficiency
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Lingareddy 1

line ad is passing through body center point so it is body diagonal
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sir check body diagonal calculation here ac^2=2a^2plz vheck
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image I have already sent u
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ac= √2a if square ac ac2=( √2a)^2=2a^2
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how ac is root 2a
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https://youtu.be/675f1B2DjlU see this video u can easily understand
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Priyanshu kumar

check this shweta...it helps you to understand
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thanks sir
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welcome😊
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Shweta is any doubt still persists??
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shweta just imagine,you are sitting in a room as a cube...and in the base square the side is a then how you find diagonal of base square equal to root 2a( root over a^2 +a^2), then come to body diagonal part...just imagine a line as the top corner of your ceiling square to just opposite corner of your floor square,the line you imagine is body diagonal which is equal to your base diagonal square plus one of side square sum, that you got as root 3a...imagine this and you get the point
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have you imagine this shweta
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Lingareddy 1

according pythagoras theorem ac2=bc2+ab2
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Lingareddy 1

ac is diagonal
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Lingareddy 1

triangle abc is right angle triangle
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Priyanshu kumar

why root 3 a is there that part??
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