lesson 3

Question 1

Are periodic changes in electric and magnetic fields which
propagate through space

Answer 1

ELECTROMAGNETIC WAVES

Question 2

Are right angle to each other and right angle to the directions
of travel

Answer 2

ELECTROMAGNETIC WAVES

Question 3

ELECTROMAGNETIC WAVES EXAMPLE

Answer 3

❖ Radio waves
❖ Microwaves
❖ Infrared-radiation
❖ Visible lights
❖ Ultraviolet rays
❖ Gamma ray

Question 4

ELECTROMAGNETIC SPECTRUM

Answer 4

Is the orderly distribution of electromagnetic waves
according to their frequencies or wavelengths in the
form separate groups having widely differing
properties

Question 5

Are generally emitted by electronic devices

Answer 5

RADIO WAVES

Question 6

radio waves are used for

Answer 6

Television Broadcasting
 Mobile Radio Communication
 Radio Navigation
 Radio Astronomy

Question 7

these waves are emitted by electronic devices such
as magnetron
➢they can be detected with a crystal detectors or
solid state detect

Answer 7

MICROWAVE

Question 8

simply the number of times a particular
phenomenon occurs in a given period of time

Answer 8

FREQUENCY

Question 9

that portion of the electromagnetic spectrum
occupied by a signal.
➢It is also a frequency range over which an
information signal is transmitted or over which a
receiver or other electronic circuit

Answer 9

BANDWIDTH

Question 10

Is used to describe the range of frequencies
required to transmit the desired information

Answer 10

CHANNEL BANDWIDTH

Question 11

Research for the specific channel with
corresponding frequency allocations of the
following:
➢ AM Radio
➢ FM Radio
➢ Television Broadcasting
➢ Telecommunication

Answer 11

CHECKPOINTS