Suppose You Observe a Star Emitting a Certain Emission Line

question 73

Essay

Suppose you observe a star emitting a certain emission line of helium at 584.8 nm.The rest wavelength of this line is 587.6 nm.How fast is the star moving? Is it moving toward you or away from you?

---

Definitions:

New Netherland

A 17th-century colonial province of the Dutch Republic that included parts of modern-day New York, New Jersey, Pennsylvania, Maryland, Connecticut, and Delaware.

Wampum

Traditional shell beads of the Eastern Woodlands tribes of Native Americans, used for trading, storytelling, and ceremonial purposes.

Pilgrims

Early settlers of the Plymouth Colony in present-day Massachusetts who arrived on the Mayflower in 1620, seeking religious freedom.

Puritans

A religious reform movement in the late 16th and 17th centuries, seeking to "purify" the Church of England of Roman Catholic practices, many of whose adherents later settled in North America.