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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

1. 1.99
2. 2.14
3. 0.50
4. 0.48

Correct answer: 2.14

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