Question

# In Moseyls law √v=a (z−b), the value of the screening constant for K−series and L−series of X−series rays are respectively :

A
1,4
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B
4,6
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C
2,4
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D
1,6.4
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Solution

## The correct option is D 1,6.4Moseley’s Law Statement : The frequency of any spectral line in characteristic X-rays spectrum directly varies as the square of the atomic number of the element emitting it, or v∝Z2 . Mathematically Moseley’s law may be written as √v=a(Z−b). Here, Z is the atomic number of the element and a and b are constants depending upon the particular line. For K-series b (called screening constant) is nearly equal to 1. Whereas for L-series b is nearly equal to 6.4.

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