If _ Cu is the wavelength of K_ X-ray line of copper (atomic number 29) and _ Mo is the wavelength of the K_ X-ray line of molybdenum (atomic number 42), then the ratio _ Cu / _ Mo is close to

JEE Advanced 2014 Physics question

If is the wavelength of X-ray line of copper (atomic number 29) and is the wavelength of the X-ray line of molybdenum (atomic number 42), then the ratio is close to

(A)1.99
(B)2.14Correct
(C)0.50
(D)0.48

Answer: (B)

Solution

Moseley's law for : , so . $ =

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Question ID VK-026311