X rays were produced using Cobalt Z 27 as target It was observed that the X ray spectrum contained a strong K line of wavelength

Question

X rays were produced using Cobalt Z 27 as target It was observed that the X ray spectrum contained a strong K line of wavelength 0 1785 nm and a weak K line of wavelength 0 1930 nm Then the weak K line is due to an impurity whose atomic number is a 25 b 26 c 28 d 30

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