Energy of an electron is given by E = - 2 . 1 7 8 × 1 0 - 1 8 J Z 2 n 2 .Wavelength of light required to excite an electron in an hydrogen atom from level n=1 to n=2 will be : h = 6.62 × 10 - 34 J s a

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Energy of an electron is given by E = - 2 . 1 7 8 × 1 0 - 1 8 J Z 2 n 2 .Wavelength of light required to excite an electron in an hydrogen atom from level n=1 to n=2 will be : h = 6.62 × 10 - 34 J s a n d c = 3.0 × 10 8 m s - 1

TestHub · Accepted Answer

E 1 = − 2.178 × 10 − 18 × 1 1 = − 2.178 × 10 − 18 J = 2.178 × 10 − 18 1.6 × 10 − 19 = 13.6 eV E 2 = − 2.178 × 10 − 8 ( 2 ) 2 = − 2.178 × 10 − 18 4 = 0.5448 × 10 − 18 J = − 3.4 eV Δ E = E 2 - E 1 = - 3 . 4 - - 1 3 . 6 = 1 0 . 2 eV λ i n Å = 12375 10.2 = 1215.6 Å ≈ 1214.4 × 10 − 10 m ≈ 1.214 × 10 − 7 m { ∴ 1 Å=10 − 10 m }

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