Image. The shown energy levels n=1 to n=7 are available in hydrogen. What is the maximum number of emission lines visible to the naked eye?
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Image. The shown energy levels n=1 to n=7 are available in hydrogen. What is the maximum number of emission lines visible to the naked eye?

G1 Physics · Accepted Answer

Step 1: For a hydrogen-like atom, Eₙ = −13.6Z²/n² eV and photon energy is ΔE = 13.6Z²|1/n₂²−1/n₁²| = hc/λ. Step 2: Use the stated transition/excitation condition to obtain the required value. Final: B: 5.