Solar Fusion

What role does the Sun play in photosynthesis?

• It provides energy for photosynthesis, releasing oxygen into the atmosphere.

• It absorbs oxygen from the atmosphere.

• It cools down the Earth's surface.

• It blocks sunlight from reaching plants.

How does the Greenhouse effect relate to the Sun's energy?

• It traps some solar energy in the atmosphere, keeping it warm.

• It reflects all solar energy back into space.

• It absorbs all solar energy, making the Earth cold.

• It has no effect on solar energy.

What is the luminosity of the Sun?

• 3.8 × 10^24 watts

• 3.8 × 10^26 watts

Why was the idea that the Sun burns fuel like coal or wood considered insufficient?

• It would cause the Sun to explode.

• It would only last a few thousand years.

• It would make the Sun too cold.

• It would make the Sun too bright.

What evidence showed that chemical reactions could not explain the Sun's longevity?

• Astronomical evidence

• Geological evidence

• Biological evidence

• Chemical evidence

What is the primary energy source of the Sun?

• Nuclear Fission

• Nuclear Fusion

• Chemical Reactions

• Solar Wind

What prevents atomic nuclei from colliding at low speeds?

• Electromagnetic attraction

• Electromagnetic repulsion

• Gravitational force

• Strong nuclear force

What is the temperature of the core of the Sun?

• 10 million degrees kelvin

• 15 million degrees kelvin

• 20 million degrees kelvin

• 25 million degrees kelvin

In the second step of the proton-proton chain, what particles are released?

• Neutrons

• Positrons

• Gamma rays

• Neutrinos