Electromagnetic Waves

1. Types of EM Waves (Wavelength shorter, Frequency higher)

2. GAMMA RAYS

2.1. Treat cancer patients

2.2. Kill harmful bacteria

2.3. Sterilise medical instruments

3. X-RAYS

3.1. Diagnose fractures in bones

3.2. Scanners in airports

4. ULTRA-VIOLET

4.1. Sunbeds

4.2. Making UV images of sun

4.3. Zapping bugs

5. VISIBLE LIGHT

5.1. Electronic devices

5.2. Microscopes

6. INFARED

6.1. Remote controllers

6.2. Ear thermometer

7. MICROWAVES

7.1. Satellite television

7.2. Microwave ovens

8. Radio Waves

8.1. Radio broadcasting

8.2. Telecommuntications

8.3. Radar

8.4. Television

9. PROPERTIES

9.1. Transverse waves

9.2. Transfers energy from one place to another

9.3. Do not require any medium

9.4. Travel at the speed of light. (3.0 x 10⁸ m s⁻¹)

9.5. Obey the laws of reflection

9.6. No electric charge

9.7. Frequency remains constant throughout. Only wavelength and speed changes fro one medium to another

10. Effects of EM waves

10.1. Infared heating

10.1.1. Feel heat from charcoal fire

10.1.2. Skin absorbs inafred waves that make us feel warm

10.2. Ionisation

10.2.1. The process of ion formation. UV rays, X-rays and gamma rays are cappable of ionising atoms

10.2.1.1. 1. Irradiation of human tissues may result in cell damage

10.2.1.2. 2. Damage to chromosomes

10.2.1.3. 3. Premature aging and shortened life-span