We Are Measuring the Spectra of Two Hydrogen Gas Clouds

question 15

Multiple Choice

We are measuring the spectra of two hydrogen gas clouds. The laboratory frame wavelength of one hydrogen line is 656.2 nm. Cloud A's emission line wavelength is 660.1 nm and Cloud B's emission line wavelength is 670.1 nm. What can we conclude about these clouds?

• A) They are both approaching us, and Cloud B is approaching faster than Cloud A.
• B) They are both receding from us, and Cloud B is receding faster than Cloud A.
• C) They are both approaching us, and Cloud A is approaching faster than Cloud B.
• D) They are both receding from us, and Cloud A is receding faster than Cloud B.

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Definitions:

Physical Closeness

The proximity or physical distance between individuals, which can impact communication, collaboration, and interpersonal relationships.

Self-actualization

The realization or fulfillment of one's talents and potentialities, considered as a drive or need present in everyone.

Productivity

The measure of efficiency in which goods or services are created, often evaluated as the output per unit of input.

Fulfillment

A feeling of satisfaction or happiness as a result of fully developing one's abilities or character.