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JEE Main 2014 Physics question

PhysicsCommunication SystemsJEE Main 2014

Not in JEE or NEET syllabus

Long-range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen the frequency of the radio waves must be in the range:

Answer: (4)

Solution

Reflection from the ionosphere requires the frequency to be below the critical frequency of about 30 MHz; below roughly a few MHz the waves are heavily absorbed

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Question ID VK-104643