The electromagnetic spectrum and parts, functions. The electromagnetic spectrum is a wide range of

1. The Electromagnetic
Spectrum

2. What is the Electromagnetic Spectrum
• The electromagnetic spectrum is the complete spectrum (or continuum) of all
forms of “light”
• An electromagnetic wave consist of electric and magnetic fields which vibrate –
thus making waves.

3. The Electromagnetic spectrum consist of:
• Radio waves
• Microwaves
• Infrared waves
• Visible light waves
• X-rays
• Gamma rays

4. Waves
• Properties of electromagnetic waves include speed, frequency and wavelength.
• Speed (s), frequency (f) and wavelength (λ) are related in the formula:
s = f x λ
• All light travel at a speed of 3 𝑥 108
m/s in a vacuum.

5. Wavelength, Frequency, Energy
• Electromagnetic wave characteristics:
 Short wavelengths have a high frequency
 Long wavelengths have a low frequency
• Electromagnetic waves and Energy:
 High frequency waves have high energy
 Low frequency waves have low energy

6. Wavelength, Frequency, Energy
Fill in the table below:
wavelength frequency energy
long
high

7. Types of Electromagnetic Waves

8. Microwaves
• Longer than radio, shorter than infrared or
visible light.
• Used for communication, medicine and
consumer use (microwave ovens).

9. Radio waves
• Low energy waves with long wavelengths
• Includes FM, AM, radar, and TV waves
• Low frequency

10. Infrared waves
• Invisible electromagnetic waves that are detected
as heat.
• Can be detected with special devices.
• Higher energy than microwaves but lower than
visible light.

11. Visible light
• The portion of the electromagnetic spectrum that
human eyes can detect.
• ROY G BIV (red, orange, yellow, green, blue,
indigo and violet)

12. Ultraviolet waves
• Higher energy than light waves
• Can cause skin cancer and blindness in human.
• Used in tanning beds and sterilizing equipment.

13. X-rays
• High energy waves
• Used in medicine, industry and astronomy.
• Can cause cancer

14. Gamma rays
• Highest energy
• Blocked from Earth’s surface by atmosphere.

15. EM WAVE
CHARACTERISTICS
OF EM WAVE
APPLICATION OF EM
WAVE
Radio Waves
Microwaves
Infrared
Visible Light
Ultraviolet Rays
X-rays
Gamma Rays
QUIZ #1

16. Assignment:
1. Give five example of EM waves that we encounter in everyday life and give a
brief explanation.

17. Thank you !