Evolution Of High-mass Stars

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Our Place in the Universe
Patterns in the Skymotions of Earth
Laws of Motion
Light and Telescopes
The Formation of Stars and Planets
Terrestrial Worlds in the Inner Solar System
Atmospheres of Venus, Earth, and Mars
The Giant Planets
Small Bodies of the Solar System
Measuring the Stars
Our Star: The Sun
Evolution of Low-Mass Stars
Evolution of High-Mass Stars
The Expansion of Space
The Realm of the Galaxies
Our Galaxy: The Milky Way
Modern Cosmology and the Origin of Structure
Life in the Universe

All Questions

Question 1

Free

True/False

All evolutionary differences between high- and low-mass stars can be attributed to differences in the amount of gravity each star possesses.

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True

False

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Question 2

Free

True/False

High-mass stars differ from low-mass stars in that they burn helium to carbon when on the main sequence.

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True

False

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Question 3

Free

True/False

Fusion reactions that create chemical elements heavier than oxygen require energy input,thus these reactions cannot provide a star with power.

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True

False

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Question 4

Free

True/False

The production of large numbers of neutrons in nuclear reactions at the core of a massive star helps rob the core of energy and speeds its eventual collapse.

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True

False

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Question 5

Free

True/False

The densest state of matter found in nature occurs inside a white dwarf star.

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True

False

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Question 6

True/False

Type Ia and Type II supernovae are approximately equal in luminosity.

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True

False

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Question 7

True/False

Most of the uranium (U; atomic mass = 238)found on the Earth was formed in Type II supernovae explosions.

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Question 8

True/False

Pulsating variable stars are more commonly known as pulsars.

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True

False

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Question 9

True/False

The abundances of elements in the Crab Nebula (image below),like all planetary nebulae,show that it formed as the byproduct of fusion present in low-mass stars.

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True

False

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Question 10

True/False

Every pulsar is a neutron star,but not every neutron star is a pulsar.

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True

False

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Question 11

True/False

Einstein's special theory of relativity implies that if a person standing at the front of a train traveling at 0.1 km/s shines a flashlight out in front of the train,the emitted photons will travel at a speed of 300,000.1 km/s.

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True

False

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Question 12

True/False

Special relativity says that moving clocks run slower.

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False

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Question 13

True/False

Gravity is nothing more than a curvature in the fabric of spacetime.

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True

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Question 14

True/False

Gravitational lensing allows us to see distant objects that would otherwise be blocked by a star or galaxy.

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True

False

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Question 15

True/False

Black holes have an infinitely small radius,but a finite event horizon.

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True

False

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Question 16

True/False

Black holes emit no light whatsoever.

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True

False

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Question 17

Multiple Choice

Which of the stars from the figure below would show variability in its brightness?

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Star A

Star B

Star C

Star D

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Question 18

Multiple Choice

If you measure the average brightness and pulsation period of a Cepheid variable star,you can also determine its:

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age

rotation period

distance

mass

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Question 19

Multiple Choice

Examine the figure below.Hydrogen burns through the CNO cycle only in high-mass main-sequence stars because of the greater __________ in their cores.

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concentration of heavy elements like carbon

densities

abundance of hydrogen

temperatures

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Question 20

Multiple Choice

As a high-mass main-sequence star evolves off the main sequence,it follows a __________ on the H-R diagram.

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nearly vertical path

path of constant radius

roughly horizontal path

None of the above answers is correct.

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