Gr 8 Natural Sciences Ch 4.1: The Sun

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What is the nature of the Sun's surface?

An invisible layer of gas

A solid layer of gas

A liquid layer of gas

A visible layer of dense gas (correct)

Why do sunspots appear to move on the Sun's surface?

Due to their own inherent motion

Due to solar wind and corona

Due to changes in the Sun's energy output

Because of the Sun's rotation on its axis (correct)

What is the duration of the solar cycle?

11-year cycle (correct)

13-year cycle

12-year cycle

10-year cycle

What is the solar wind composed of?

Gas particles released from the corona Signup and view all the answers

How can sunspots be tracked in real-time?

Through various astronomical resources Signup and view all the answers

What is the primary composition of the Sun?

Hydrogen and helium Signup and view all the answers

What is the process by which the Sun generates energy?

Nuclear fusion Signup and view all the answers

What is the surface temperature of the Sun?

5500°C Signup and view all the answers

What is the purpose of a filter or pinhole projector when observing the Sun?

To protect the eyes from damage Signup and view all the answers

What is the term for the movement of fluid caused by differences in temperature and density within the fluid?

Convection Signup and view all the answers

What is the term for the cooler, dark areas on the Sun's surface?

Sunspots Signup and view all the answers

What is the term for the stream of charged particles released from the upper atmosphere of the Sun?

Solar wind Signup and view all the answers

What equation describes the energy released by the Sun's nuclear fusion reactions?

E = mc^2 Signup and view all the answers

What is the primary reason the Sun is essential for life on Earth?

It provides light and heat Signup and view all the answers

Which of the following processes occurs in the Sun's core?

Nuclear fusion Signup and view all the answers

Why is it dangerous to look directly at the Sun?

It can cause permanent eye damage Signup and view all the answers

What is the approximate temperature of the Sun's core?

15,000,000°C Signup and view all the answers

How does the energy generated in the Sun's core reach the Earth?

Through the spread of heat and light Signup and view all the answers

What is the composition of sunspots?

Cool, dark gas Signup and view all the answers

What is the Sun's role in the solar system?

It is the center of the solar system Signup and view all the answers

What is the term for the collection of planets and other celestial bodies that orbit the Sun?

Solar system Signup and view all the answers

What occurs on the Sun's surface during a solar flare?

A sudden release of significant amounts of energy and particles Signup and view all the answers

What is the primary purpose of using images and videos from sources like the SOHO space satellite?

To safely study the Sun and its activity Signup and view all the answers

What is the correlation between the number of sunspots and the Sun's energy output?

The number of sunspots varies in an 11-year cycle, correlating with the Sun's energy output Signup and view all the answers

What is the outer atmosphere of the Sun that releases gas particles into space?

The corona Signup and view all the answers

What is the visible layer of dense gas on the Sun's surface that becomes opaque?

The photosphere Signup and view all the answers

What percentage of the Sun's composition is made up of elements other than hydrogen and helium?

5% Signup and view all the answers

What is the primary mechanism by which the energy generated in the Sun's core is transferred to its surface?

Convection Signup and view all the answers

What is the temperature difference between the Sun's surface and its core?

14.5 million °C Signup and view all the answers

What is the reason why sunspots appear darker than the surrounding areas on the Sun's surface?

They have a lower temperature Signup and view all the answers

What is the approximate time it takes for energy generated in the Sun's core to reach its surface?

17,000 to 100,000 years Signup and view all the answers

What is the term for the reaction that occurs in the Sun's core, where hydrogen nuclei combine to form helium?

Nuclear fusion Signup and view all the answers

What is the primary reason why the Sun appears as a small, bright point of light in the night sky?

Due to its immense distance from Earth Signup and view all the answers

What is the process by which the energy released from the Sun is transferred to the Earth?

Radiation Signup and view all the answers

What is the primary reason for the 11-year solar cycle?

Changes in the Sun's magnetic field Signup and view all the answers

What is the primary consequence of a solar flare?

A sudden increase in the Sun's energy output Signup and view all the answers

What is the primary purpose of using images and videos from sources like the SOHO space satellite?

To track the movement of sunspots Signup and view all the answers

What is the relationship between the number of sunspots and the Sun's energy output?

The number of sunspots is directly proportional to the Sun's energy output Signup and view all the answers

What is the term for the visible layer of dense gas on the Sun's surface that becomes opaque?

Photosphere Signup and view all the answers

Gr 8 Natural Sciences Ch 4.1: The Sun

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Questions and Answers

What is the nature of the Sun's surface?

Why do sunspots appear to move on the Sun's surface?

What is the duration of the solar cycle?

What is the solar wind composed of?

How can sunspots be tracked in real-time?

What is the primary composition of the Sun?

What is the process by which the Sun generates energy?

What is the surface temperature of the Sun?

What is the purpose of a filter or pinhole projector when observing the Sun?

What is the term for the movement of fluid caused by differences in temperature and density within the fluid?

What is the term for the cooler, dark areas on the Sun's surface?

What is the term for the stream of charged particles released from the upper atmosphere of the Sun?

What equation describes the energy released by the Sun's nuclear fusion reactions?

What is the primary reason the Sun is essential for life on Earth?

Which of the following processes occurs in the Sun's core?

Why is it dangerous to look directly at the Sun?

What is the approximate temperature of the Sun's core?

How does the energy generated in the Sun's core reach the Earth?

What is the composition of sunspots?

What is the Sun's role in the solar system?

What is the term for the collection of planets and other celestial bodies that orbit the Sun?

What occurs on the Sun's surface during a solar flare?

What is the primary purpose of using images and videos from sources like the SOHO space satellite?

What is the correlation between the number of sunspots and the Sun's energy output?

What is the outer atmosphere of the Sun that releases gas particles into space?

What is the visible layer of dense gas on the Sun's surface that becomes opaque?

What percentage of the Sun's composition is made up of elements other than hydrogen and helium?

What is the primary mechanism by which the energy generated in the Sun's core is transferred to its surface?

What is the temperature difference between the Sun's surface and its core?

What is the reason why sunspots appear darker than the surrounding areas on the Sun's surface?

What is the approximate time it takes for energy generated in the Sun's core to reach its surface?

What is the term for the reaction that occurs in the Sun's core, where hydrogen nuclei combine to form helium?

What is the primary reason why the Sun appears as a small, bright point of light in the night sky?

What is the process by which the energy released from the Sun is transferred to the Earth?

What is the primary reason for the 11-year solar cycle?

What is the primary consequence of a solar flare?

What is the primary purpose of using images and videos from sources like the SOHO space satellite?

What is the relationship between the number of sunspots and the Sun's energy output?

What is the term for the visible layer of dense gas on the Sun's surface that becomes opaque?

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