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Iron (z=26) emits line of wavelength $1 {.96 A}^{0}$ . For an element of unknown atomic number the wavelength of line is $0 {.49 A}^{0} .$ The atomic number of the unknown element is

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Correct option is A

λ2λ1=(z1−1z2−1)2 0.491.96=(26−1z2−1)2=625(z2−1)2 12=25z2−1z2−1=50 z2=51

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Iron (z=26) emits line of wavelength1.96 A0 . For an element of unknown atomic number the wavelength of line is 0.49 A0. The atomic number of the unknown element is

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Iron (z=26) emits line of wavelength $1 {.96 A}^{0}$ . For an element of unknown atomic number the wavelength of line is $0 {.49 A}^{0} .$ The atomic number of the unknown element is