The **wavelength of the light emitted** when the electron in the hydrogen atom undergoes a transition from level n = 4 to n = 3 can be calculated using the speed of light:

$\overline{){\mathbf{c}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}{\mathbf{\lambda}}{\mathbf{\xb7}}{\mathbf{v}}}$

c = speed of light = 3.0x10^{8} m/s

λ = wavelength, in m

*Since we don’t have a frequency, we can rearrange the equation:*

*$\mathbf{v}\mathbf{}\mathbf{=}\mathbf{}\frac{\mathbf{c}}{\mathbf{\lambda}}$*

*Recall the energy equation:*

Calculate the wavelength of light emitted when the electron in the hydrogen atom undergoes a transition from level n4 to n3?

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