Nuclear Physics and RadioactivityHard
Question
The wavelength of Kα X-rays of two metals ′A′ and ′B′ are 
and 
respectively, where ′R′ is Rydberg constant. The number of elements lying between ′A′ and ′B′ according to their aomic number is :
and respectively, where ′R′ is Rydberg constant. The number of elements lying between ′A′ and ′B′ according to their aomic number is :Options
A.3
B.6
C.5
D.4
Solution
= R(Z - 1)2 
For wavelength of Kα n1 = 1 to n2 = 2
= R (ZA - 1)2
................(i)and
= R[ZB - 1]2 ...............(ii)By solving eq. (i) & (ii) we get
ZA = 26 and ZB = 31
[For elements lie between these two]
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