Calculate the Wavelength, in Nanometers, of the Light Emitted by a Hydrogen

question 105

Multiple Choice

Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron falls from the n = 7 to the n = 4 principal energy level.Recall that the energy levels of the H atom are given by E_n = -2.18 × 10^-18 J(1/n²)

• A)9.18 × 10^-20 nm
• B)4.45 × 10^-20 nm
• C)2.16 × 10^-6 nm
• D)2.16 × 10³ nm
• E)1.38 × 10¹⁴ nm

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