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The Wavelengths of K(alpha) X - rays of ...

The Wavelengths of `K_(alpha)` X - rays of two metals A and B are `4/(1875R) and 1/(675)R` respectively, where R is Rydberg constant . The number of elements lying between A and B according to their atomic numbers is

A

`3`

B

`6`

C

`5`

D

`4`

Text Solution

Verified by Experts

The correct Answer is:
D
`(1)/(lambda)=R(Z-1)^(2)xx(1-(1)/(4))`
`rArr(1875R)/(4)=R(Z_(1)-1)^(2)(3)/(4) " "rArrZ_(1)=26`
and `675R=R(Z_(2)-2)^(2). (3)/(4)" "rArrZ_(2)=31`
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