All of the Following Observations Are Real

question 109

Multiple Choice

All of the following observations are real. Which one does not support the theory that active galactic nuclei are powered by accretion disks around massive black holes?

• A) The most luminous active galactic nuclei have huge redshifts.
• B) X-ray emission from active galactic nuclei can vary significantly in times as short as a few days.
• C) The total luminosity of an active galactic nucleus can be as high as about 10 billion times that of the Sun.
• D) Spectra of active galactic nuclei show that clouds of gas are orbiting a central object at very high speed.

---

Definitions:

Insurance Products

Financial products provided by insurance companies designed to protect against risk, such as life, health, and property insurance.

Gym Memberships

Contracts or subscriptions that grant individuals access to fitness facilities and equipment, often including additional services and classes.

Sales Engineers

Professionals who combine technical knowledge with sales skills to provide advice and support on a range of products, particularly technical or industrial equipment.

Service Salespeople

Professionals who specialize in selling intangible products or services rather than physical goods.