The element which has a Kα X-rays line of wavelength 1.8˚A is (R=1.1×107m−1,b=1 and √533=0.39)
Co,Z=27
Iron,Z=26
Mn,Z=25
Ni,Z=28
A
Ni,Z=28
B
Iron,Z=26
C
Co,Z=27
D
Mn,Z=25
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Solution
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1λ=Z2R(1n21−1n22)
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