A Disk of Gas Orbits a Supermassive Black Hole

question 56

Multiple Choice

A disk of gas orbits a supermassive black hole.What can astronomers use to determine the mass of the black hole from the properties of this disk?

• A) Wien's law
• B) the Doppler shift
• C) Polarization
• D) the Stefan-Boltzmann law

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Definitions:

Variable Inputs

Refers to inputs used in production that can be adjusted in the short term to meet changes in output levels, such as labor or raw materials.

Returns To Scale

A concept in economics that describes how a proportionate increase in all inputs affects the level of output.

Variable Cost

A cost that increases when the firm increases its output and decreases when the firm reduces its output.

Short Run

Describes a period during which at least one factor of production is fixed, limiting the ability of a firm to adjust to changes in market demand or supply conditions.