Earth and Space - The Sun as an Energy Source

Grade 3IB

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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H

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Energy from the Sun reaches Earth in the form of electromagnetic radiation, specifically visible light and infrared (heat) energy.

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6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2

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H_2O_{(l)} \rightarrow H_2O_{(g)}

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Solar panels can capture the Sun's energy to produce electricity, which is a renewable energy source.

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1.5 \times 10^7 \text{ } ^\circ C

📐Formulae

E = mc^2

1 \text{ AU} \approx 1.5 \times 10^8 \text{ km}

v = \frac{d}{t}

H + H \rightarrow He + \text{Energy}

💡Examples

Problem 1:

3 \times 10^5 \text{ km/s}

Solution:

t = \frac{1.5 \times 10^8 \text{ km}}{3 \times 10^5 \text{ km/s}} = 500 \text{ seconds}

Explanation:

d

Problem 2:

Identify the gas that makes up the majority of the Sun's mass and the gas it turns into during energy production.

Solution:

H

Explanation:

Inside the Sun, Hydrogen atoms fuse together to form Helium through a process called nuclear fusion, releasing massive amounts of energy.

Problem 3:

\Delta T = 40^\circ C

Solution:

T_{final} = 25^\circ C + 40^\circ C = 65^\circ C

Explanation:

The Sun's infrared radiation provides heat energy, raising the internal temperature of the oven.