Question

Wavelength of the  characteristics X-ray of iron and potassium are  cm and  cm respectively The atomic number (approximately) of the element for which characteristics  wavelength is  cm is (atomic number of iron is 26 and atomic number is potassium is 19)

A

24

B

28

C

41

D

30

Medium

Solution

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Correct option is A)

From Moseley's Law,
Thus

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