An EM wave of maximum frequency 300 kHz and critical freqeuncy 100 kHz is to be transmitted to a height equal to 150 k. calculate the skip distance.

If sound waves of frequency 20 KHz are to be transmitted directly, then the length of the dipole antenna required is

Three waves A , B and C of frequencies 1600kHz , 5MHz and 60 MHz , respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communications:

Three waves A,B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respectively are to be transmitted from one place to another.Which of the following is the appropriate mode of communication?

Three waves A,B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respectively are to be transmitted from one place to another.Which of the following is the appropriate mode of communication?

Three wave A,B and C of frequencies 1600 KHz, 5 MHz and 60 MHz respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communication?

Three waves A,B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respectively are to be transmitted from one place to another.Which of the following is the appropriate mode of communication?