When a electron jumps from a higher energy state to a lower energy state with an energy difference of Δ E electron-volt, then the wavelength of the spectral line emitted is approximately

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Energy, h ν = Δ E electron volt. ⇒ h c λ = Δ E electron volt. ⇒ λ = h c Δ E = 6.6 × 10 - 34 × 3 × 10 8 Δ E But, 1 eV = 16 × 10 - 19 J ∴ λ = 6.6 × 10 - 34 × 3 × 10 8 Δ E × 16 × 10 - 19 m ⇒ λ = 12375 × 10 - 10 Δ E m ⇒ λ = 12375 Δ E A ∘

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