Light and Sound - Science Worksheets - Free Printable

Problem:

The task is to determine whether each light source listed in the image is man-made or natural. Here is the list of light sources:

1. The sun's light
2. Light from a lamp
3. Light from a firefly
4. Light from a flashlight
5. Light from the stars
6. Light from a candle
7. The moon's light
8. Light from a television
9. Light from a light bulb
10. Light from a cell phone
11. Light from lightning
12. Light from a bonfire

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Solution:

To solve this, we need to classify each light source based on whether it originates naturally (without human intervention) or is created by humans.

#### Step-by-Step Classification:

1. The sun's light:
- Natural
- Explanation: The sun is a natural celestial body that emits light due to nuclear fusion.

2. Light from a lamp:
- Man-made
- Explanation: Lamps are artificial devices designed and manufactured by humans to produce light.

3. Light from a firefly:
- Natural
- Explanation: Fireflies produce light through a natural biological process called bioluminescence.

4. Light from a flashlight:
- Man-made
- Explanation: Flashlights are human-designed devices that use batteries and bulbs to produce light.

5. Light from the stars:
- Natural
- Explanation: Stars emit light naturally through nuclear reactions in their cores.

6. Light from a candle:
- Man-made
- Explanation: Candles are human-made objects that produce light through combustion when lit.

7. The moon's light:
- Natural
- Explanation: The moon does not produce its own light; it reflects sunlight, which is a natural phenomenon.

8. Light from a television:
- Man-made
- Explanation: Televisions are electronic devices designed by humans to display images and produce light.

9. Light from a light bulb:
- Man-made
- Explanation: Light bulbs are human-invented devices that convert electrical energy into light.

10. Light from a cell phone:
- Man-made
- Explanation: Cell phones are electronic devices designed by humans to produce light for screens and displays.

11. Light from lightning:
- Natural
- Explanation: Lightning is a natural atmospheric phenomenon caused by electrical discharges in the sky.

12. Light from a bonfire:
- Man-made
- Explanation: Bonfires are intentionally created by humans using wood or other combustible materials.

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Final Answer:

| Light Source | Classification |
|----------------------------|----------------|
| The sun's light | Natural |
| Light from a lamp | Man-made |
| Light from a firefly | Natural |
| Light from a flashlight | Man-made |
| Light from the stars | Natural |
| Light from a candle | Man-made |
| The moon's light | Natural |
| Light from a television | Man-made |
| Light from a light bulb | Man-made |
| Light from a cell phone | Man-made |
| Light from lightning | Natural |
| Light from a bonfire | Man-made |

$$
\boxed{
\begin{array}{ll}
\text{The sun's light} & \text{Natural} \\
\text{Light from a lamp} & \text{Man-made} \\
\text{Light from a firefly} & \text{Natural} \\
\text{Light from a flashlight} & \text{Man-made} \\
\text{Light from the stars} & \text{Natural} \\
\text{Light from a candle} & \text{Man-made} \\
\text{The moon's light} & \text{Natural} \\
\text{Light from a television} & \text{Man-made} \\
\text{Light from a light bulb} & \text{Man-made} \\
\text{Light from a cell phone} & \text{Man-made} \\
\text{Light from lightning} & \text{Natural} \\
\text{Light from a bonfire} & \text{Man-made} \\
\end{array}
}
$$