4. EXPLAIN
• 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.
5. EXPLAIN
• Recall 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.
6. EXPLAIN
• 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 3x108 m/s.
7. • There are seven different types of EM waves.
They are arranged in a gradual progression
from the waves of lowest frequency to highest
frequency. This arrangement of EM waves is
called electromagnetic spectrum.
EXPLAIN
9. Practical Applications
• Radio and television
• Global Positioning System (GPS
• Magnetic Resonance Imaging (MRI)
• Satellite communication
• Terrestrial communication
• Cooking
• RADAR (Radio Detection and
Ranging)
• Remote control (IR remote)
• Infrared scanner
• Night vision goggles
• Diagnosing bone fractures
• Treat tumors and cancer through the
process called radiotherapy
• Two-way radio communication
EXPLAIN
10. Practical use of Electromagnetic wave
• Electromagnetic
wave is also use in
our
communication
devices such as;
• Cellphone
• Two-way radio
(FM transceiver)
11.
12. Connections
• We use the
ELECTROMAGNETIC
WAVE to
communicate
daily using our
device
• In English subject, we
are taught how to
communicate
properly through
writing and speaking
that is why we have
formal theme for
writing and oral
declamations for
speaking.
13. Alternative use of Electromagnetic
waves
• Because of the pandemic, schooling becomes
virtual through the use of internet and the
use of printed self-learning materials
14. Alternative mode of delivering
education
• FM
broadcasting
• The use of
two-way radio
for class
15. Alternative mode of delivering
education
THE USE OF TWO-WAY RADIO FOR DISTANCE LEARNING
16. Effects of Electromagnetic (EM) radiation on living
things and the environment
• The effect of EM
radiation on organisms
and environment
depends on how much
energy it carries.
Radiation can be non-
ionizing and ionizing.
Non-ionizing radiation
does not have enough
energy to remove
electrons from atoms
and molecules.
17. Effects of Electromagnetic (EM) radiation on living
things and the environment
• When the exposure is
intense and direct, it
may result in damage to
tissue due to heat. Right
amount of non-ionizing
radiation like UV rays
maintain the proper
mechanism of
ecosystem.
