A Galaxy Is Observed Receding from Earth with a Speed

question 38

Multiple Choice

A galaxy is observed receding from Earth with a speed of 9800 km/s.A redshifted spectral line originating in the galaxy is compared to the same spectral line originating in the laboratory.If Hubble's law is valid for this galaxy,what is the ratio of the wavelength of the redshifted line to that of the unshifted line if the Hubble constant is 22 km/s per million light-years? (c = 3.00 × 10⁸ m/s,1 ly = 9.461 × 10¹⁵ m,1 y = 3.156 × 10⁷ s)

• A) 1.033
• B) 1.052
• C) 1.072
• D) 1.091
• E) 1.130

---

Definitions:

Incidence of Depression

The rate or frequency at which new cases of depression occur in a specified population over a particular period of time.

Life Satisfaction

A measure of an individual's overall contentment with their life, often considered in psychological studies as a component of subjective well-being.

Endocrine System

A network of hormone-secreting glands associated with changes in the individual’s mood, metabolism, and growth. The glands associated specifically with puberty include the pituitary gland, the thyroid gland, the adrenal glands, and the sex glands (gonads).

Hormone-Secreting Glands

Organs or tissues in the body that release hormones directly into the blood or surrounding tissues, influencing various bodily functions.