Atoms And Nuclei Question 293

Question: The element which has a Kα x-rays line of wavelength 1.8 A is ( R=1.1×107m1,b=1 and 5/33=0.39 )

Options:

A) Co, Z=27

B) Iron, Z=26

C) Mn, Z=25

D) Ni, Z=28

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Answer:

Correct Answer: A

Solution:

  • 1λα=3R4(Z1)2
    (Z1)=43Rλα=43×1.1×107×1.8×1010 =2003533=783=26
    Z=26+1=27


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