Question 1

What is the difference between brightness and luminosity?

Accepted Answer

A) These are different names for the same property. 
B) Luminosity is how much light we see from a star;brightness is how much light it emits. 
C) Brightness is how much light we see from a star;luminosity is how much light it emits. 
D) Luminosity measures size;brightness measures temperature. 
E) Brightness measure size;luminosity measures temperature. 
A) These are different names for the same property. 
B) Luminosity is how much light we see from a star;brightness is how much light it emits. 
C) Brightness is how much light we see from a star;luminosity is how much light it emits. 
D) Luminosity measures size;brightness measures temperature. 
E) Brightness measure size;luminosity measures temperature.

Question 2

Stars of spectral class O have the strongest hydrogen absorption lines,whereas stars of spectral class M have the weakest hydrogen absorption lines.

Accepted Answer

A) True 
 B)False

Question 3

A star's mass is the only characteristic that determines its position in the H-R diagram.

Accepted Answer

A) True 
 B)False

What is the difference between brightness and luminosity?

Stars of spectral class O have the strongest hydrogen absorption lines,whereas stars of spectral class M have the weakest hydrogen absorption lines.

A star's mass is the only characteristic that determines its position in the H-R diagram.

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornments Moons and Rings

Dwarf Planets and Small Solar System Bodies

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

The Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

Exam 13: Taking the Measure of Stars

What is the difference between brightness and luminosity?

Stars of spectral class O have the strongest hydrogen absorption lines,whereas stars of spectral class M have the weakest hydrogen absorption lines.

A star's mass is the only characteristic that determines its position in the H-R diagram.

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornments Moons and Rings

Dwarf Planets and Small Solar System Bodies

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

The Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters