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Blazing goIITian

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2 Apr 2009 14:28:04 IST

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The atomic no. Z of an element whose K wavelength is =11. The atomic no. of an element whose K

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The atomic no. Z of an element whose K wavelength is =11. The atomic no. of an element whose K wavelength is 4 is equal to ______

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tina

Blazing goIITian

Joined: 25 Oct 2008

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2 Apr 2009 14:30:57 IST

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the correct answer is 6. but , can any one tell me the method.

s faiyaz

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Joined: 30 Mar 2009

Posts: 335

2 Apr 2009 23:41:59 IST

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moseley law for a particular characteristic X-ray series, frequency^1/2 = a(Z-b), where a and b are constants

for K_alpha series b = 1, now take the ratio of first to second as wavelength ratio 1 : 4

frequency ratio 4 : 1

frequency square root ratio 2 : 1 so 2/1 = (11-1)/(z-1) gives z = 6

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