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The wavelength of K(alpha) X-rays of two...

The wavelength of `K_(alpha)` X-rays of two metals `A and B` are` 4 // 1875 R and 1// 675 R`, respectively , where `R` is rydberg 's constant. The number of electron lying between `A and B` according to this lineis

A

3

B

6

C

5

D

4

Text Solution

Verified by Experts

The correct Answer is:
D
`1/lambda=R(Z-1)^(2) times (1-1/4)`
`rArr (1875R)/4=R(Z_(1)-1)^(2) times 3/4 rArr Z_(1)=26`
and `675R=R(Z_(2)-2)^(2) times 3/4 rArr Z_(2)=31`
Hence, a number of elements = 4
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