A Metal Crystallizes Into Two Cubic Phases Fcc And Bcc Whose Unit cell Lengths Are 3.5 And 3.0 Å Respectively. What Is The Ratio Of Densities Of Fcc And Bcc?

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Question

A metal crystallizes into two cubic phases fcc and bcc whose unit cell lengths are 3.5 and 3.0 Å respectively. What is the ratio of densities of fcc and bcc?

Solution

Correct option is

1.259

 

fcc unit cell length (a1) = 3.5 Å   

bcc unit cell length (a2) = 3.0 Å 

                  = 1.259

Testing

SIMILAR QUESTIONS

Q1

The X-ray power pattern of potassium chloride shows a cone at θ = 90o, using X-ray of wavelength 1.54 × 10–8 cm. What is the spacing between the planes?      

Q2

When an electron in an excited Mo atom falls from L to K, shell, an X-ray is emitted. These X-ray are diffracted at angle of 7.75 by planes with a separation of 2.64 Å. What is the difference in energy between K-shell and L-shell in Mo assuming a first order diffraction (sin 7.75 = 0.1349)?

Q3

A compound formed by elements A and B crystallises in cubic structure where B atoms are at the corner of a cube and A atoms at the face centre. The formula of the compound is    

Q4

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Q5

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Q6

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Q7

Ag metal crystallises in a cubic closest packed arrangement with the edge of the unit cell having a length a = 407 pm. The radius of the similar atom is 

Q8

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Q9

A compound CuCl has fcc structure. Its density is 3.4 g cm–3, what is the length of unit cell?

Q10

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