20. Assume the electron density is 106 cm-3 in a certain layer of ionsphere. Which of the following
問題詳情
20. Assume the electron density is 106 cm-3 in a certain layer of ionsphere. Which of the following frequency of electromagneticwaves that could pass through that layer? (A) 12 MHz (B) 8 MHz (C) 4 MHz (D) 1 MHz