When Astronomers Look for Evidence of Hydrogen Gas in the Spectra

question 180

Multiple Choice

When astronomers look for evidence of hydrogen gas in the spectra of the Sun, the planets, or the nearby stars, the positions of the spectral features or "lines" due to hydrogen are in

• A) a pattern in which the positions of the lines depend on the temperature of the source.
• B) the same pattern for the Sun and for planetary sources but very different for stars at larger distances because of absorption of light by the interstellar matter.
• C) the same characteristic pattern as seen in the laboratory, a pattern unique to hydrogen.
• D) a pattern that depends on the location of the planet or star and that can be reproduced only with difficulty in the laboratory.

---

Definitions:

Collective Bargaining

The process of negotiation between employers and a group of employees aimed at agreements to regulate working conditions, wages, and other employment terms.

Flextime

A flexible work schedule that allows employees to vary their arrival and departure times, often to accommodate personal needs and improve work-life balance.

Scheduling System

A system used to organize, coordinate, and allocate time and resources effectively for tasks or events.

Downsizing

The process of reducing the number of employees within a business, often to cut costs and improve efficiency.