Name the type of waves which are used by astronatus of communicate with one another on moon (or in outer space).

Name the type of waves which are used for sound ranging.

Which waves are used to transmit voice communication ?

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?

What type of wave are used as carrier wave in a communication system?

Which of following waves are used for satellite communication ?

What does the term LOS communication mean ? Name the types of waves that are used for his communication. What is the range of their frequency?

Name any one type of mechanical wave.