All of the Following Observations Are Real

question 10

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

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Definitions:

Consumers' Incomes

The total amount of money earned by the population, affecting purchasing power and consumer behavior in the economy.

Epidemic

A widespread occurrence of an infectious disease in a community at a particular time.

Fuel-Efficient

describes vehicles or machinery that use less fuel to achieve a certain distance or task, thereby reducing fuel consumption and emissions.

Equilibrium Price

Prevailing market price at which you can buy an item.