The document discusses electromagnetic wave theory. It explains that electromagnetic waves are produced by vibrating electric and magnetic fields based on Maxwell's equations. The document then discusses key scientists like Maxwell, Faraday, Hertz and their contributions to understanding electromagnetic waves. It also discusses how electromagnetic waves can transfer energy and do not require a medium, traveling at the speed of light. Examples of applications of electromagnetic waves like radio, Wi-Fi, satellites, and medical imaging are provided.

1. SCIENCE QUARTER 2
(PHYSICS)

3. Question:
1. How can you describe the different picture
shown on the presentation?
2. What do you think will be our topic for this
day?

4. ELECTROMAGNETIC
WAVE THEORY

5. OBJECTIVES:
1. Describe how electromagnetic (EM) wave is
produced and propagated.
2. Trace the Timeline of EM wave theory

6. ELECTROMAGNETIC
WAVE THEORY

7. Question:
1. What have you observed on the video
presented?

8. ACTIVITY NO. 1
You have learned about waves during your
Science 7 class. Let’s recall some important
terms about waves. Below are descriptions of
different terms relating to waves and the
jumbled letters which will form the correct
term. Your task is to rearrange the jumbled
letters to form the term being described below.

10. ACTIVITY NO. 2
Match up the different contributions of the
following scientist in the field of discovery of
EM waves.

11. __1. Andrei Marie Ampere A. Contributed in developing
equations that showed the
relationship of electricity and
magnetism
__2. Michael Faraday B. Showed experimental evidence of
electromagnetic waves and their link
to light
__3. Heinrich Hertz C. Demonstrated the magnetic effect
based on the direction of current
__4. James Clerk Maxwell D. Formulated the principle behind
electromagnetic induction.
__5. Hans Christian Oersted E. Showed how a current carrying
wire behaves like a magnet

12. C 1. Andrei Marie Ampere A. Contributed in developing
equations that showed the
relationship of electricity and
magnetism
D 2. Michael Faraday B. Showed experimental evidence of
electromagnetic waves and their link
to light
B 3. Heinrich Hertz C. Demonstrated the magnetic effect
based on the direction of current
A 4. James Clerk Maxwell D. Formulated the principle behind
electromagnetic induction.
E 5. Hans Christian Oersted E. Showed how a current carrying
wire behaves like a magnet

13. What is Electromagnetic (EM) Wave?
Electromagnetic wave (EM wave) or
electromagnetic radiation is a wave that is
created as a result of vibrations between an
electric field and magnetic field, hence known
as “electromagnetic wave”.

14. Based on Oersted’s discovery: A changing
electric field produces magnetic field. A
changing magnetic field is therefore produced
around a vibrating charge. And according to
Michael Faraday, the changing magnetic field
will produce electric field.

15. A wave carries energy as it propagates, EM
wave does the same, too. EM waves can travel
through anything even on vacuum, meaning
they do not need any medium to travel. They
travel in a vacuum at a speed of 3.0 x 108 m/s.

16. A wave carries energy as it propagates, EM
wave does the same, too. EM waves can travel
through anything even on vacuum, meaning
they do not need any medium to travel. They
travel in a vacuum at a speed of 3.0 x 108 m/s
which is denoted by c, the speed of light.

17. The wave speed, frequency, and wavelength are
related by the following equation: v=λf
Where v is the wave speed, or c (speed of
light) expressed in meters per second (m/s),
the frequency (f) is expressed in Hertz and
the wavelength (λ) is expressed in meters.

18. WHAT IS ELECTROMAGNETIC
WAVE THEORY?

19. Electromagnetic wave theory was given by
James Clerk Maxwell. The main points of
electromagnetic wave theory were : “When an
electrically charged particle moves under
acceleration, alternating electrical and
magnetic fields are produced and transmitted.
These fields are transmitted in the form of
waves”

20. The Electric and Magnetic Fields Together
Accelerating electrons produce electromagnetic
waves. These waves are a combination of electric
and magnetic fields. As accelerated electrons
produce an electric field of a wave, the varying
electric field produces the wave’s magnetic field.
Both the electric field and the magnetic field
oscillate perpendicular to each other and to the
direction of the propagating wave.

21. Since electromagnetic waves are types of waves created as a
result of vibrations between an electric field and magnetic
field, they can be found in the following
machineries/technologies such as:
a. Radio, Cellphone and Television
b. Satellites
c. Cooking appliances such as Microwave oven
d. Infrared cameras
e. Fiber Optics
f. Energy Efficient lamp and Tanning lamp
g. Medical Imaging and treatment machines

22. Based on our discussion:
1. What is an EM wave?
2. How about EM wave theory?
3. How does EM wave was produced?
4. How does the discovery EM Waves help the life of
the people today?

23. DIRECTION:
READ EACH STATEMENT CAREFULLY AND
ONLY THE LETTER OF THE CORRECT ANSWER.
QUIZ

24. 1. He is the Scientist who contributed in
developing equations that showed the
relationship of electricity and magnetism and
created the EM Wave Theory?
A. James Clerk Maxwell
B. Hans Christian Oersted
C. Heinrich Hertz
D. Michael Faraday

25. 2. Which of the following is NOT an application
of EM waves?
A. Radio and Television
B. Satellites
C. Fiber Optics
D. Electric Fan

26. 3. What do you call the waves that is created as
a result of vibrations between electric field and
magnetic field?
A. Sound wave
B. EM wave
C. Water Wave
D. Light Wave

27. 4. The disturbance in space is known as ____?
A. Wave
B. Electricity
C. Frequency
D. Wavelength

28. 5. What is the speed of EM wave as it travel in a
vacuum?
A. 1.0 x 108 m/s
B. 2.0 x 108 m/s
C. 3.0 x 108 m/s
D. 4.0 x 108 m/s