Which of the following statements is wrong?(a) Ground wave propagation can be sustained at frequencies 500 kHz to 1500kHz(b) Satellite communication is useful for the frequencies above 30 MHz(c) Space wave propagation takes place through tropospheric space(d) Skywave propagation is useful in the range of 30 to 40 MHzThis question was addressed to me by my college professor while I was bunking the class.My doubt stems from Communication Systems in portion Communication Systems of Physics – Class 12

Which of the following statements is wrong?(a) Ground wave propagation

1.	Which of the following statements is wrong?(a) Ground wave propagation can be sustained at frequencies 500 kHz to 1500kHz(b) Satellite communication is useful for the frequencies above 30 MHz(c) Space wave propagation takes place through tropospheric space(d) Skywave propagation is useful in the range of 30 to 40 MHzThis question was addressed to me by my college professor while I was bunking the class.My doubt stems from Communication Systems in portion Communication Systems of Physics – Class 12
Answer» Right option is (d) Skywave propagation is USEFUL in the range of 30 to 40 MHz The best explanation: Skywave propagation is useful for radio-waves of frequencies RANGING from 2 MHz to 30 MHz. Higher frequencies than this value cannot be reflected by the IONOSPHERE. All the other statements are CORRECT.

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