Ultra sound is produced by

Options :
  1. lead bead
  2. lithium chloride
  3. barium rode
  4. none of these
Answer and Explanation :-

Answer: Option 1

Explanation:

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Let us try to teach generosity and altruism, because we are born selfish. Let us understand what our own selfish genes are up to, because we may then at least have the chance to upset their designs, something that no other species has ever aspired to do.
-Richard Dawkins The Selfish Gene