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

question 81

Multiple Choice

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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Definitions:

Assisted Living

A residential option for seniors who need help with some daily activities like bathing, dressing, and medication management.

ADLs

Activities of Daily Living, which are routine activities people do every day without assistance, such as eating, bathing, dressing, and moving around.

Eating

The act of consuming food.

Bathing

The act of washing oneself or another, typically in a container filled with water, such as a bathtub or shower.