wireless networking

1. Wireless networks are computer networks that
are not connected by cables of any kind.

2. that users can move around freely within
the area of the network with their laptops,
handheld devices etc
Easy to install (no wires)
Transmission speed is high

5. a machine-readable code consisting of an
array of black and white squares, typically
used for storing URLs or other information
for reading by the camera on a
smartphone.

6. Microwaves
are a form of
electromagneti
c radiation with
frequencies
between 300
MHz and 300
GHz

7.  microwaves are used for mobile phones and Wi-Fi.
 Requires line of sight
 Two way communications used in two different antenna
 Distance covered based upon height of antenna.
 uni directional

9.  Line of sight (LoS) is a type of propagation that can transmit and
receive data only where transmit and receive stations are in view of
each other without any sort of an obstacle between them. FM radio,
microwave and satellite transmission are examples of line-of-sight
communication.

11. moving or operating in a single direction.

12.  In radio communications, a radio receiver (receiver or
simply radio) is an electronic device that
receives radio waves and converts the information
carried by them to a usable form. It is used with an
antenna.

13. The up arrow symbolises upload of data
from your phone/PC/any system onto
the internet. The down arrow symbolises
download of data from theinternet to your
system.

14.  Transmits music,conversation,pictures.
 No line of sight requires
 Omni directional
 Feratures:AM FM radio,television,cordless
telephone,cellular phones,paging,wireless LAN
 Radio waves are used to transmit television
and radio programmes,
 Radio waves have longer wavelengths and are
reflected by the ionosphere (part of the Earth's
atmosphere).
 wavelengths from 1 millimeter to 100
kilometers.Heigher than microwaves.

15. Radio
waves
Micro
waves

20.  Communications satellites bounce signals from
one side of Earth to the other, a bit like giant
mirrors in space
 it creates a communication channel between a
source transmitter and a receiver at different
locations on Earth
 First active, direct-relay communications satellite-
TELSTAR 1 in 1962
 On June 19, 1981 India launched its
first geostationary satellite called APPLE. It was
an experimental communication satellite launched
by the Indian Space Research Organisation
(ISRO)

21. Remote sensing is the science of
obtaining information about objects or
areas from a distance.
Detection of water pollution ,oil
field,monitoring and reporting of weather
conditions

23.  A remote control uses light waves just
beyond the visible spectrum of light—
 to change channels on your TV.
 wavelengths longer than those of visible light,
but shorter than those of radio waves.
 range of wavelengths corresponds to a
frequency range of approximately 430
THz down to 300 GHz.
 Below infrared is the microwave portion of the
electromagnetic spectrum.

24. Used for short range communication
Use Line Of Site
Cannot penetrate solid objects like wall
Large bandwidth

25. Infrared radiation can be used as a heating source.
Ex- to remove ice from the wings of aircraft
Cosmetic application
Infrared rays penetrate the skin up to 3-4 mm
Infrared Photography
Astronomy
Devices are used to communicate
betweenkeyboard,mouse,printer with PC’s.