Question 1

A plot of temperature vs. luminosity for stars is known as the ______.&#10;A) Einstein graph&#10;B) HR diagram&#10;C) mass graph&#10;D) luminosity graph

Accepted Answer

The correct term for a plot of temperature vs. luminosity for stars is the HR diagram, which stands for Hertzsprung-Russell diagram. This diagram is a key tool in understanding the life cycle and characteristics of stars.

Question 2

_____ of stars will lie on the main sequence.&#10;A) 45%&#10;B) 50%&#10;C) 75%&#10;D) 90%

Accepted Answer

90%&#10;

Question 3

__________ are small bright dead cores of stars like our sun.&#10;A) Neutron stars&#10;B) Black holes&#10;C) White holes&#10;D) White dwarfs

Accepted Answer

White dwarfs are the remnants of stars like our Sun that have exhausted their nuclear fuel and shed their outer layers, leaving behind a hot, dense core that gradually cools over time.

Question 4

A main sequence star has a luminosity class of&#10;A) III&#10;B) IV&#10;C) V&#10;D) Ib

Accepted Answer

Main sequence stars are classified with a luminosity class of V. This class indicates stars that are in the main phase of their lifecycle, fusing hydrogen into helium in their cores.

Question 5

Our sun belongs to the luminosity class ____.

Accepted Answer

The answer of Our sun belongs to the luminosity class...

Question 6

Ordinary Giants are luminosity class ____.

Accepted Answer

The answer of Ordinary Giants are luminosity class ____....

Question 7

Most stars are not on the main sequence.

Accepted Answer

Most stars, including the Sun, are on the main sequence, where they spend the majority of their lifetimes fusing hydrogen into helium in their cores.

Question 8

Stars on the main sequence that are more luminous are smaller in size.

Accepted Answer

Stars on the main sequence that are more luminous are typically larger in size and have higher masses, not smaller. Luminosity increases with mass and size for main sequence stars.

Deck 59: The H-R Diagram