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365_88904_IMG_20140311_132805.jpg

Grade:12

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
7 years ago
applying the formula
1/@=R×Z^2(1/n1^2 -1/n2^2) [@=wavelength]
1/3×10^-8 =109677(1 -1/4)×Z^2
Z=20

thanks and regards
sunil kr
askIItian faculty

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