Parallax/Brightness/Luminosity Practice

What is the difference between brightness and luminosity?

• Brightness is the total energy emitted by a source; luminosity is the perceived light from that source.
• Brightness measures the distance of a light source; luminosity measures its color.
• Brightness is a scientific measurement; luminosity is a subjective experience.
• Brightness is the perceived light from a source; luminosity is the total energy emitted by that source.

Tags

NGSS.HS-PS4-3

What is the most reliable method for deriving distances to other stars?

• Parallax method
• Redshift measurement
• Spectroscopic analysis
• Luminosity comparison

what is the difference between parallax motion and proper motion?

• Parallax motion is the actual movement of a star, while proper motion is an apparent shift due to viewing angle.
• Parallax motion is an apparent shift due to viewing angle, while proper motion is the actual movement of a star across the sky.
• Proper motion is the change in brightness of a star, while parallax motion is its distance from Earth.
• Parallax motion refers to the speed of a star, while proper motion refers to its color.

Tags

NGSS.HS-PS2-1

The distance to a star is​ (a)   proportional to the parallax angle.

• Inversely
• directly

What two factors determine stellar brightness?

• Color and temperature
• distance and energy output

• Mass and age
• Composition and rotation speed

Match the types of brightness to its definition

• How bright the object appears on Earth

• Apparent brightness

• amount of starlight that reaches Earth

• Apparent Magnitude

• How bright star actually is

• Absolute Magnitude

Star A has a apparent magnitude of .58 and Star B has an apparent magnitude of .98. Which star would appear brighter?

• Star A

• Star B

• They are the same brightness

Reorder the following from brightest (1) to dimmest (4) based on absolute magnitude.

• -2.6

• 1.3

• 1.2

• -10.5

Reorder the following from brightest (1) to dimmest (4) based on apparent magnitude.

• -2.6

• 1.2

• 1.3

• -10.5

According to the new system of classifying star brightness, what does a smaller magnitude number indicate?

• The star is dimmer.

• The star is of medium brightness.

• The star is brighter.

• The star's brightness cannot be determined.