Question

figure 1. simple model of fusion in the sun.

1. diagram question use figure 1. what is the main product formed during fusion in the sun, and what else is released?

a. oxygen and sound
b. helium and energy
c. carbon dioxide and water
d. iron and gravity

1. written response why does the sun stay stable for a very long time instead of immediately exploding or collapsing? use the idea of balanced forces in your answer.

Explanation:

Analyze the fusion diagram

$$ \text{Reactants: } 4 \times \text{Hydrogen nuclei } (\text{H}) ightarrow \text{Products: } 1 \times \text{Helium nucleus } (\text{He}) + \text{Energy released as radiation} $$

Identify the balanced forces in stellar stability

$$ \text{Inward Force: Gravity} \iff \text{Outward Force: Thermal/Radiation Pressure} $$

Answer:

Question 6

• (A) Oxygen and sound
• (B) Helium and energy (Correct answer)
• (C) Carbon dioxide and water
• (D) Iron and gravity

Question 7

The Sun remains stable due to hydrostatic equilibrium, where the inward pull of gravity is perfectly balanced by the outward thermal pressure generated by nuclear fusion in its core.