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

question 82

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 En = -2.18 × 10^-18 J (1/n²) .(c = 3.00 × 10⁸ m/s; h = 6.63 × 10^-34 J • s)

• A)4.45 × 10^-20 nm
• B)2.16 × 10^-6 nm
• C)9.18 × 10^-20 nm
• D)1.38 × 10¹⁴ nm
• E)2.17 × 10³ nm

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