A blue line in the spectrum of the hydrogen atom has a wavelength $\lambda$ = 486 nm.In the hydrogen-atom spectrum emitted by a distant galaxy,this line is observed on Earth at $\lambda$ = 550 nm.With what speed is this galaxy receding from us? (The speed of light is 3.0 $\times$ 10⁸ m/s.) A)1.31 $\times$ 10⁷ m/s B)1.13 $\times$ 10⁸ m/s C)2.65 $\times$ 10⁸ m/s D)3.49 $\times$ 10⁷ m/s E)3.95 $\times$ 10⁷ m/s

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The Answer of A blue line in the spectrum of the hydrogen atom has a wavelength $\lambda$ = 486 nm.In the hydrogen-atom spectrum emitted by a distant galaxy,this line is observed on Earth at $\lambda$ = 550 nm.With what speed is this galaxy receding from us? (The speed of light is 3.0 $\times$ 10⁸ m/s.) A)1.31 $\times$ 10⁷ m/s B)1.13 $\times$ 10⁸ m/s C)2.65 $\times$ 10⁸ m/s D)3.49 $\times$ 10⁷ m/s E)3.95 $\times$ 10⁷ m/s

A Blue Line in the Spectrum of the Hydrogen Atom λ\lambdaλ

A Blue Line in the Spectrum of the Hydrogen Atom $\lambda$