The document provides instructions for a pretest on electromagnetic waves, including key concepts and their definitions such as wave, crest, trough, amplitude, wavelength, and frequency. It covers the properties of electromagnetic waves, their relationship with light, and highlights the contributions of pioneering scientists like James Clerk Maxwell and Heinrich Hertz. Additionally, it outlines the electromagnetic spectrum and emphasizes that EM waves do not require a medium for propagation.

1. ELECTROMAGNETIC
WAVE

2. PRETEST
INSTRUCTION: Rearrange the
jumbled letters.
1. It is a disturbance in space.
AVWE
WAVE

3. LET’S REVIEW:
2. It is the highest point in the wave.
SECRT
CREST

4. LET’S REVIEW:
3. It is the lowest point in the wave
TGHURO
TROUGH

5. LET’S REVIEW:
4. It is the distance from the midpoint to the highest
point or lowest point of the wave.
LMUPTDEAI
AMPLITUDE

6. LET’S REVIEW:
5. It is the distance between two successive
identical parts of a wave.
ENEVTGWLAH
WAVELENGTH

7. LET’S REVIEW:
6. It refers to the number of waves
produced in one second.
NEQFCEURY
FREQUENCY

8. Activity 1. The Anatomy of the
Wave
2.
4.
1.
3.

9. Parts of a Wave
Crest
Trough
Amplitude = A
Wavelength = λ
• The wavelength is the distance
between two successive wave
particles that are in phase.
• The longer the wavelength, the
lower the frequency and the
energy of the wave. The shorter
the wavelength, the higher the
frequency and the energy of the
wave.

11. What are Electromagnetic
Waves?
• They are called EM waves
or EM radiation
• They are created as a
result of vibrations
between an electric field
and a magnetic field.

12. What are Electromagnetic
Waves?
The sun emits EM radiation. EM waves are all around us.

13. He formulated the Electromagnetic
Wave Theory which says that an
oscillating electric current should be
capable of radiating energy in the
form of electromagnetic waves.
Pioneering Scientist
James Clerk Maxwell
1865

14. • Scottish scientist who formulated the
electromagnetic theory, which
established a closer relationship
between electromagnetism and light.
He based this theory on the already
established ideas that a changing
electric field, in turn, generates an
electric field . From this Maxwell
predicted the existence of
electromagnetic waves.
Pioneering Scientist
James Clerk Maxwell
1865

15. • First to generate and detect
electromagnetic waves in a
laboratory setting
• Showed radio waves could be
reflected, refracted and diffracted
• The unit Hz is named for him
Hertz’s Confirmation of Maxwell’s
Predictions
Heinrich Hertz

16. The Electromagnetic Spectrum
The electromagnetic spectrum is a continuum of EM waves arranged
according to wavelength or frequency.

17. The Electromagnetic Spectrum
 Mnemonics: Roman Men Invented Very Unusual Xray Guns
 Radio Waves, Microwaves, Infrared, Visible Light, Ultraviolet, Xray,
Gamma Rays

18. Properties of Electromagnetic
Waves
1. Electromagnetic waves travel at in a vacuum, the same speed of light.
2. Electromagnetic waves are transverse waves because the oscillating electric field
and magnetic field are perpendicular to each other and to the direction of
propagation of the wave.
3. The ratio of the strengths of the electric field and the magnetic field in an
electromagnetic wave is equal to the speed of light.
4. An electromagnetic wave transports linear momentum and energy, which can be
transferred to an object placed along its path.
5. Electromagnetic waves may be polarized
6. Electromagnetic waves do not need a material medium of propagation.

19. Properties of Electromagnetic
Waves
1. They are transverse waves. Electric and magnetic fields oscillate in a
plane that is perpendicular to the propagation of the wave.

20. Properties of Electromagnetic
Waves
2. EM waves are created by an oscillating charged particle, which
creates an oscillating electric field and magnetic field.

21. Properties of Electromagnetic
Waves
3. They do not require a medium to propagate.
MECHANICAL WAVES require a medium to propagate. EM waves do not.

22. Properties of Electromagnetic
Waves
3. They can travel in vacuum at a speed of
3x10*8 m/s = 300,000,000 m/s, the same as the speed of light.

23. Properties of Electromagnetic
Waves
4. Speed of EM waves changes depending on the medium where they are
passing through.

33. Applications of EM waves

34. Group Activity:

35. Assignm
ent