13–2 Electromagnetic Spectrum

Group of all the EM Waves is known as spectrum.

Types of EM Radiation

Uses of EM Waves

1. Radio waves

• FM radio
• Long distance communication

2. Micro waves

• Radar system
• Microwave oven
• To study atomic and molecular structure

3. Infrared waves

• Earth satellites
• Wi-Fi Signals
• Thermal imaging cameras
• Used in Solar water heaters and cookers
• TV Remotes, LED etc.

4. Visible rays

• Vision
• Traffic signals

5. Ultraviolet rays

• Kill germs
• Eye surgery
• Burglar alarms and security system
• To distinguish between real and fake gems.

6. X-rays

• Body Imaging
• To kill cancers cells
• To detect flaws or cracks in metals
• Detection of explosives, opium etc.

7. Gamma rays

• To destroy cancer cells
• Metal printing
• Atomic bombs
• Insecticide disinfection for wheat and flour.

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