One second is defined to be equal to

Q. One second is defined to be equal to

  1. 9192631770 periods of the cesium clock
  2. 1650763.73 periods of the cesium clock
  3. 652189.63 periods of the krypton clock
  4. 1650763.73 periods of the krypton clock

Answer: 9192631770 periods of the cesium clock

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