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Question

According to Moseleys law the ratio of the slopes of graph between v and Z for kβ and kα is:

A
3227
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B
2732
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C
3322
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D
2233
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Solution

The correct option is A 3227
Moseley's law is given by:

f= cR(1n211n22)(zb)

where f is frequency

c is speed of light

R is Rydberg constant

For the K-series, b=1

For Kα: n1=1 and n2=2

For Kβ: n1=1 and n2=3

ForKα=f=cR(114)(z1)=cR(34)(z1)ForKβ=f=cR(119)(z1)=cR(89)(z1)Ratioofslopes= 89cR 34cR=3227

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