Module 5: Stellar Evolution and Classification

Module 5: Stellar Evolution and Classification

University

15 Qs

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Module 5: Stellar Evolution and Classification

Module 5: Stellar Evolution and Classification

Assessment

Quiz

Science, Physics

University

Easy

Created by

Deanna Murray

Used 1+ times

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15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

As the surface temperature of a star increases, the wavelength of maximum brightness

decreases

stays the same

increases

may change. More information is needed.

Answer explanation

This is according to Wien’s Law, which says temperature and peak wavelength are inversely proportional

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If you detect a star that has weak lines of hydrogen and helium in its spectrum, what is the most likely conclusion?

The star formed primarily out of heavier elements

The star's photosphere has a low temperature

The star's photosphere has a high temperature

The star's photosphere is unusually dense

Answer explanation

Media Image

O-F type stars have strong (A have the strongest) Hydrogen absorption lines. Cooler stars lack strong H absorption lines.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A star that is cool and very luminous must have

a very large radius

a very small radius

a very small mass

a very great distance

a very low velocity

Answer explanation

Media Image

To be a cool star and still have a high luminosity means the star is large, like a red supergiant.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Stars that appear red but are not very luminous are located in what part of the H-R diagram?

Upper left

Lower left

Upper right

Lower right

Near the Sun

Answer explanation

Media Image

These stars are the red dwarfs

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

After its main sequence phase, the Sun's luminosity will

decrease

stay approx. the same

increase

steadily fluctuate about its main sequence luminosity

Answer explanation

The sun will move right (toward lower temperature) and up (toward higher luminosity) when it moves off of the main sequence and enters its giant phase.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A star leaves the main sequence when

it has converted all of its hydrogen into helium throughout the star

it has converted all of its hydrogen into helium in its core

it has converted all of its helium into carbon in its core

it begins to fuse hydrogen into helium in its core

Answer explanation

This is the beginning of the transition to becoming a giant star

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

As low-mass stars evolve off the main sequence, they become more luminous because

surface temp increase

surface temp decrease

sizes increase

sizes decrease

surface temp + sizes both increase

Answer explanation

Although the temperature of a star decreases after is moves off of the main sequence, the large increase in radius while becoming a giant causes an increase in overall luminosity.

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