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If lambda(c mu ) is the wavelength of K(...

If `lambda_(c mu )` is the wavelength of `K_(a) X - rays line of cappor (atomic number 29) and `lambda_(Mo) ` is the wavelength of the `k_(a)` X- rays line of molyndenum (atomicnumber 42) then ratio `lambda_(ca) ^(1 lambda_(Mo)` is close to

A

`1.99`

B

`2.14`

C

`0.50`

D

`0.48`

Text Solution

Verified by Experts

The correct Answer is:
B
`(lambda_(ca))/(lambda_(Mo)) = ((Z_(Mo) - 1)^(2))/((Z_(ca) - 1)^(2)) = ((42 - 1)/(29 - 1))^(2) = ((41)/(28))^(2) = 2.14`
` [:. Sqrt (nu = (Z-b) here b= `
`nu = (Z-1)^(2)`
`(1)/(lambda) prop (Z-1)^(2)`]`
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