Ultrasonic waves can be used to

Ultrasonic waves can be used to
  1. detect submarines and icebergs
  2. clean clothes and fine machinery parts
  3. to kill smaller animals like rats, fish, frogs, etc.
  4. All of the above

Solution

(i) Ultrasonic waves can be used to detect submarines icebergs. (ii) Ultrasonic waves can be used to clean clothes, fine machinery parts, etc. (iii) These waves can be used to kill smaller animals like rats, fish, frogs, etc.

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