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If λ Cu is the wavelength of K α X-ray line of copper (atomic number 29) and λ Mo is the wavelength of the K α X-ray line of molybdenum (atomic number 42), then the ratio λ Cu / λ Mo is close to -
- 1.99
- 2.14
- 0.50
- 0.48
Correct answer: 2.14
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