Which of the following is not electromagnetic wave in nature

Options :
  1. infrared rays
  2. ultraviolet rays
  3. radar waves
  4. sound waves
Answer and Explanation :-

Answer: Option 4

Explanation:

Electromagnetic wave does not require medium.

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She belongs to the winter that is past, to the darkness that is over, and has no part or lot in the life I shall lead for the next six months. Oh, I could dance and sing for joy that the spring is here! What a ressurection of beauty there is in my garden, and of brightest hope in my heart.
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