JEE Main 2013 Physics question
Not in JEE or NEET syllabus
This question has Statement-1 and Statement-2. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement-1: Short wave transmission is achieved due to the total internal reflection of the e-m wave from an appropriate height in the ionosphere. Statement-2: Refractive index of a plasma is independent of the frequency of e-m waves.
Answer: (1)
Solution
Short waves are bent back to earth by the ionosphere, which acts like total internal reflection at a suitable height (Statement 1
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