Complete the electromagnetic spectrum by dragging images and descriptions to the correct positions.

To solve this problem, we need to arrange the parts of the electromagnetic spectrum in order from the shortest wavelength (highest energy) on the left to the longest wavelength (lowest energy) on the right.

Step 1: Order the Wavelengths
Looking at the top scale in the diagram, the numbers go from smallest to largest as you move to the right:
$10^{-13}\text{ cm}$ (Smallest/Shortest) $\rightarrow$ $1\text{ km}$ (Largest/Longest).

Therefore, the correct order of the waves from left to right is:
1. Gamma Ray (Shortest wavelength, highest frequency)
2. X-ray
3. Ultraviolet
4. Visible Light
5. Infrared
6. Microwave
7. Radio Wave (Longest wavelength, lowest frequency)

Step 2: Match Pictures and Descriptions
Now we match the pictures and text descriptions provided in the bottom section to these positions. Note that some descriptions in the image appear to be swapped or tricky, so we must rely on scientific facts to place them correctly.

* Position 1 ($10^{-13}\text{ cm}$): Gamma Ray
* Picture: The yellow radiation symbol (☢️).
* Description: "Used for sterilising medical equipment and food, and detection and treatment of some cancers." (This describes high-energy gamma rays).

* Position 2 ($10^{-9}\text{ cm}$): X-ray
* Picture: The skeleton hand (X-ray image).
* Description: "Used for medical imaging and airport security scanners."

* Position 3 ($10^{-6}\text{ cm}$): Ultraviolet
* Picture: The purple glowing lights (often used to check money or hygiene).
* Description: "Used for sterilising water and killing bacteria. Also used to detect forged bank notes."

* Position 4 ($10^{-4}\text{ cm}$): Visible Light
* Picture: The camera.
* Description: "Used for lighting, photography, and fibre optic communications."

* Position 5 ($10^{-2}\text{ cm}$ to $1\text{ cm}$): Infrared
* Picture: The remote control (remotes use infrared signals).
* Description: "Used for short-range communications, e.g. TV remotes. Also for electrical heaters, cooking food [grills], optical fibres and thermal imaging cameras." (*Note: The text box labeled "infrared" in the image actually contains the description for microwaves, while the text box labeled "microwave" contains the description for infrared. We place the description about remotes/heaters here because it matches the physics of Infrared.*)

* Position 6 ($1\text{ cm}$): Microwave
* Picture: The microwave oven.
* Description: "Used for satellite communications and cooking food." (*Note: This text is found in the box labeled "x-ray" in the image, but it correctly describes Microwaves.*)

* Position 7 ($1\text{ km}$): Radio Wave
* Picture: The large satellite dish antenna.
* Description: "Used for radio and TV broadcasting and satellite communication." (*Note: This text is found in the box labeled "ultraviolet" in the image, but it correctly describes Radio Waves.*)

Final Answer:

Here is the correct order from Left (Shortest Wavelength) to Right (Longest Wavelength):

1. Gamma Ray: Picture of Radiation Symbol ☢️ | Description: "Used for sterilising medical equipment..."
2. X-ray: Picture of Skeleton Hand 🦴 | Description: "Used for medical imaging and airport security scanners."
3. Ultraviolet: Picture of Purple Lights 💜 | Description: "Used for sterilising water... detect forged bank notes."
4. Visible: Picture of Camera 📷 | Description: "Used for lighting, photography..."
5. Infrared: Picture of Remote Control 📱 | Description: "Used for short-range communications, e.g. TV remotes... thermal imaging cameras."
6. Microwave: Picture of Microwave Oven | Description: "Used for satellite communications and cooking food."
7. Radio Wave: Picture of Satellite Dish 📡 | Description: "Used for radio and TV broadcasting and satellite communication."