A radar that detects the presence of an enemy aircraft uses :

Options :
  1. Sound Waves
  2. Radio Waves
  3. Electronic Waves
  4. Ultrasonic Waves
Answer and Explanation :-

Answer: Option 1

Explanation:

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Though my work may be menial, though my contribution may be small, I can perform it with dignity and offer it with unselfishness. My talents may not be great, but I can use them to bless the lives of others.... The goodness of the world in which we live is the accumulated goodness of many small and seemingly inconsequential acts.
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