What Is Happening in a Star That Is on the Main

question 93

Multiple Choice

What is happening in a star that is on the main sequence on the Hertzsprung-Russell diagram?

• A) The star is generating energy by helium fusion, having stopped hydrogen "burning."
• B) The star is slowly shrinking as it slides down the main sequence from top left to bottom right across the H-R diagram.
• C) Stars that have reached the main sequence have ceased nuclear "burning" and are simply cooling down by emitting radiation.
• D) The star is generating internal energy by hydrogen fusion.

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Definitions:

Total Expenditure

The aggregate amount of money spent by consumers to purchase goods and services.

Isocost Line

A graph representing all combinations of inputs that have the same total cost for a firm.

Price of Capital

The cost of borrowing money to purchase or invest in capital assets, often reflected in interest rates or return expectations.

Price of Labor

The compensation received by workers for their services, typically in the form of wages or salaries, which can be influenced by factors such as skill levels, supply and demand, and economic conditions.