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    What is the cut-off frequency?
    
    
    
	44. What is the cut-off frequency?
    
      - The highest frequency at which a waveguide mode may propagate without being attenuated
 
      - The lowest frequency at which a waveguide mode may propagate without being attenuated
 
    
    Answer: B) The lowest frequency at which a waveguide mode may propagate without being attenuated.
    Explanation:
    Cut-off frequency is defined as the lowest frequency at which a waveguide mode may propagate without being attenuated.