Light sources worksheet - Free Printable

Let's solve this step-by-step based on the worksheet titled "Light and Dark Sources".

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Question 1: Are they light sources?

We need to determine which of the listed items are light sources — that is, objects that produce their own light.

Let’s go through each one:

1. Lamp – ✔ Yes
A lamp produces light when turned on (electricity powers a bulb). It is a light source.

2. Torch – ✔ Yes
A torch (flashlight) emits light from its bulb. It is a light source.

3. Mirror – ✘ No
A mirror does not produce light; it reflects light. So it is not a light source.

4. Curtain – ✘ No
Curtains block or filter light but do not emit light. Not a light source.

5. Sun – ✔ Yes
The Sun generates its own light through nuclear fusion. It is the brightest natural light source.

6. Moon – ✘ No
The Moon does not produce its own light. It reflects sunlight. So it is not a light source.

7. Candle – ✔ Yes
A lit candle produces light through combustion. It is a light source.

8. Eyes – ✘ No
Eyes detect light but do not produce it. They are not light sources.

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✔ The four light sources are:
- Lamp
- Torch
- Sun
- Candle

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Question 2: Order the four light sources by brightness

Now we need to arrange the four light sources in order from brightest to least bright.

Let’s compare them:

1. Sun – The Sun is the brightest light source in our environment. It outshines everything else.
2. Torch – A typical flashlight is very bright, especially compared to a candle.
3. Lamp – A household lamp can be quite bright, but usually less than a torch (especially if it's a small desk lamp).
4. Candle – A candle gives off dimmer light compared to others. It is the least bright among these.

But wait — let's reconsider the relative brightness:

- Sun: Extremely bright → Brightest
- Torch: Very bright (can shine far)
- Lamp: Depends, but typically less than a torch (unless it's a powerful one), so quite bright
- Candle: Soft glow → Least bright

So the correct order is:

| Brightness Level | Light Source |
|------------------|--------------|
| Brightest | Sun |
| Very bright | Torch |
| Quite bright | Lamp |
| Least bright | Candle |

> Note: In some contexts, a lamp might be brighter than a torch, depending on the type. But generally, for children's science activities, a torch is considered brighter than a lamp because it's focused and often has a stronger bulb.

So final answer:

✔ Answer for Question 2:

- Brightest: Sun
- Very bright: Torch
- Quite bright: Lamp
- Least bright: Candle

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✔ Final Solution Summary:

#### 1. Which are light sources?
- ✔ Lamp
- ✔ Torch
- ✔ Sun
- ✔ Candle
- ✘ Mirror, Curtain, Moon, Eyes

#### 2. Order of brightness:
1. Brightest → Sun
2. Very bright → Torch
3. Quite bright → Lamp
4. Least bright → Candle

You would cut out the pictures of Sun, Torch, Lamp, Candle and paste them in that order.

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Let me know if you'd like a printable version or help with formatting!