The ratio of difference in wavelengths of \( 1^{\text {st }} \) and...

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The ratio of difference in wavelengths of \( 1^{\text {st }} \) and \( 2^{\text {nd }} \) lines of Lyman series in \( \mathrm{H} \)-like atom to difference in wavelength for 2 nd and \( 3^{\text {rd }} \) lines of same series is:
(A) \( 2.5: 1 \)
(B) \( 3.5: 1 \)
(C) \( 4.5: 1 \)
(D) \( 5.5: 1 \)
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