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Match the following: List I List II A. Penetration frequency 1. Lowest frequency at which charged particles spiral in fixed magnetic field B. Optimum working frequency 2. Same as critical and frequency C. Gyro frequency 3. Highest frequency of radio waves that can be used D. Maximum usable frequency 4. The most effective frequency for ionosphere propagation of radio waves

A-2, B-4, C-1, D-3
A-4, B-1, C-3, D-2
A-1, B-3, C-2, D-4

Correct Answer: A-2, B-4, C-1, D-3

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