height of hcp unit cell


 

2 years ago

Share

Answers : (1)

                    

Dear Mukal,


A,B,C,E (red dots) will represents the centres of sphere of atoms in HCP closed packing,


now, AB=BC=CA=EB = 2R (edge lengths of HCP)


BD=\frac{2R}{\sqrt{3}}  ,as BD divides the median through B in 2:1 ratio from B...


now EDB is rt. triangle,


by pythagores theorem :


(\frac{2R}{\sqrt{3}})^2+h^2=(2R)^2


=> h=2R\sqrt{\frac{2}{3}}


now, their will be another atom which will be mirror image of E on plane ABC


so, the height (c) of HCP will be 2h


c=2h=4R\sqrt{\frac{2}{3}}


Best Of luck


Cracking IIT just got more exciting,It s not just all about getting assistance from IITians, alongside Target Achievement and Rewards play an important role. ASKIITIANS has it all for you, wherein you get assistance only from IITians for your preparation and win by answering queries in the discussion forums. Reward points 5 + 15 for all those who upload their pic and download the ASKIITIANS Toolbar, just a simple  to download the toolbar….


So start the brain storming…. become a leader with Elite Expert League ASKIITIANS


Thanks


Aman Bansal


Askiitian Expert



2 years ago

Post Your Answer

More Questions On IIT JEE Entrance Exam

Ask Experts

Have any Question? Ask Experts
Post Question
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!!
Click Here for details
what does the transaction details mean in the declaration form
 
 
Hello Dear student, You have to give the transaction details of the counselling fee , you give the reference number of acknowledgment slip of the payment made to iit.
  img
Sher Mohammad 10 days ago
i got 112 i jee-mains. what college can i get?
 
 
The link below is IIT JEE Main Branch and College Predictor.You can use it to get the answer to your query. http://www.askiitians.com/iit-jee/main/college-branch-predictor.html Thanks...
  img
Aziz Alam 13 days ago
What would be the best way to revise the class 11 syllabus before the end of the year? Also I have covered the the whole syllabus once well and I have to attend school as well as coaching.
 
 
The best way to revise what you have studied in class 11 is to solve as many questions as possible which will test your concepts and also expose the areas which are weak or needs...
  img
Aziz Alam 4 days ago
Hello How can I access the last 10 years questions? Will it be helpful? Shashank
 
 
Dear Shashank Previous year papers are very helpful in IIT JEE prepration. Check the link to access the previous year IIT JEE papers provided bt ASKIITians.com...
 
Badiuddin askIITians.ismu Expert 4 years ago
How to practise curve tracing ? It is not in most of the books .. Any book ?
 
 
There are lot of videos on you tube watch them, sher mohammad faculty askiitians b.tech, iit delhi
  img
Sher Mohammad 17 days ago
I have got 147 marks in jee mains and 91% in isc board. What should be my college preference in jee mains ? Please help i am very confused ?
 
 
You should give more prefrence to branch rather than college, try to fill choices for cse, ee, mech etc good branches , and give priority to first nits, then other goverment colleges.
  img
Sher Mohammad 10 days ago
View all Questions »