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:

Population Standard Error

A measure of the estimation uncertainty in predicting a population parameter based on a sample statistic.

Confidence Interval

A confidence interval is a range of values derived from sample data that is likely to cover the true value of an unknown population parameter.

Mean

The average of a set of numbers, calculated by adding all the numbers together and dividing by the count of those numbers.

Sampling Error

Differences between statistics calculated from a sample and statistics pertaining to the population from which the sample is drawn due to random, chance factors.