# ELECTROMAGNETIC WAVES 2

```Did you call somebody today using your
smartphone?
station?
Have you tried cooking your food in a
microwave oven?
ELECTROMAGNETIC
WAVE
REVIEW/RECALL
A wave is a temporary disturbance
that transfer energy from one
place to another
MECHANICAL WAVES - is a wave that is not
capable of transmitting its energy through
a1 vacuum. Mechanical waves require a1
medium in order to transport their energy
from one location to another. A sound wave
is an example of a mechanical wave.
ELECTOMAGNETIC WAVE - is a wave that is
capable of transmitting its energy through
a vacuum. Electromagnetic waves are
produced by the vibration of charged
particles. Electromagnetic waves that are
produced on the sun subsequently travel to
Earth through the vacuum of outer space.
How are
Electromagnetic
waves formed?
Electromagnetic waves are formed when an
electric field comes in contact with a
magnetic field.
Electricity and Magnetism can be static,
but changing magnetic field will induced
electric field and vise-versa
These changing fields form
ELECTROMAGNETIC WAVES
The electric field and field of an
electromagnetic wave are perpendicular
(at right angles) to each other.
The electric field and magnetic field
are also perpendicular to the direction
of the EM wave energy
EM waves travels with at constant
velocity of 3.00 x 108 m/s in vacuum
EM waves are capable of showing
diffraction or interference
EM waves are transverse waves
CHARACTERISTICS
OF WAVES
1. AMPITUDE (A)- Height of a wave, usually
measured in meter (m)
2. WAVE LENGHT - The distance between
two consecutive crest or troughs and
usually measured meter
```