Home
Class 12
PHYSICS
Assertion: Space waves are used for line...

Assertion: Space waves are used for line -of -sight communication.
Reason: Space wave travels in a straight line from transmitting antenna to the receiving antenna.

A

A and R both are true and R is correct explaination of A

B

A is true but R is false

C

A is false but R is true

D

Both are false

Text Solution

Verified by Experts

The correct Answer is:
A

A space travels in a straight line from transmitting antenna to the receiving antenna. Space wave are used for line-of-sight communication as well as satellite comunication As frequencies above 40 MHz communication is essentially limited t line-of-sight paths.
Promotional Banner

Topper's Solved these Questions

  • COMMUNITCATION SYSTEMS

    NCERT FINGERTIPS ENGLISH|Exercise Introduction|2 Videos
  • COMMUNITCATION SYSTEMS

    NCERT FINGERTIPS ENGLISH|Exercise Elements Of A Communication System|4 Videos
  • COMMUNITCATION SYSTEMS

    NCERT FINGERTIPS ENGLISH|Exercise NCERT|9 Videos
  • ATOMS

    NCERT FINGERTIPS ENGLISH|Exercise Assertion And Reason|15 Videos
  • CURRENT ELECTRICITY

    NCERT FINGERTIPS ENGLISH|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

Assertion: The surface wave propagation is used for medium wave band and for television broadcasting. Reason: The surface waves travel directly from transmitting antenna to receiver antenna through atmosphere.

Name the type of waves which are used for line of sight (LOS) communication. What is the range of their frequencies? A transmitting antenna at the top of a tower has a height of 20m and the height of the receiving antenna is 45m. Calculate the maximum distance between them for satisfactory communication in LOS mode. (Radius of the Earth = 6.4 xx 10^(6) m)

What does the term LOS communication mean? Name the types of waves that are used for this communication. Which of the two height of transmitting antenna and height of receiving antenna can effect the range over which this mode of communication remains effective?

A ground receiver in line-of-sight communication cannot receive direct waves due to

A ground receiver in line-of-sight communication cannot receive direct waves due to

As the e.m. waves travel in free space

Assertion : Electromagnetic waves do not require medium for their propagation. Reason : They can't travel in a medium.

Is it necessary for a transmitting antenna to be at the same height asthat of the receiving antanna for line of sight communication? A TV transmitting antenna is 81 m tall. How much service area can it cover, if the receiving antena is at the ground level?

Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for the of sight communication ? A TV transmitting antenna is 81m tall. How much service area can it cover, if the receiving antenna is at the ground level ?

The sum of the heights of transmitting and receiving attennas in line of sight of communication is fixed at h, find the height of two antennas when r ange is maximum.