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What is conductivity?

Back

Conductivity is the ability of a material to conduct electric current. Materials that allow electric current to pass through them easily are called conductors, while those that do not are called insulators.

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What is a nebula?

Back

A nebula is a giant cloud of dust and gas in space. Nebulae can be the birthplace of stars, where gas and dust come together to form new stars.

Front

What is a star?

Back

A star is a massive, luminous sphere of plasma held together by gravity. Stars produce energy through nuclear fusion in their cores, which makes them shine.

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What does the Hertzsprung-Russell diagram represent?

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The Hertzsprung-Russell diagram is a scatter plot of stars showing the relationship between their absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

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What are white dwarfs?

Back

White dwarfs are small, dense stars that are the remnants of stars that have exhausted their nuclear fuel and shed their outer layers. They are typically very hot but have low luminosity.

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What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into different substances with different properties. Examples include rusting iron or burning wood.

Front

What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting ice or tearing paper.

Front

What is average speed?

Back

Average speed is the total distance traveled divided by the total time taken. It is a measure of how fast an object is moving on average over a period of time.

Front

What is the difference between distance and displacement?

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Distance is the total path length traveled by an object, while displacement is the shortest straight-line distance from the initial to the final position, along with the direction.

Front

What is energy?

Back

Energy is the ability to do work or cause change. It exists in various forms, including kinetic, potential, thermal, chemical, and electrical energy.