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  1. If an electron and a positron annihilate, the energy released is
  2. Two tuning forks are sounded together and produce 2 beats per second.
  3. A boy whirls a stone in a horizontal circle of radius 1.5 m and at height 2.0 m
  4. The near point and far point of a person are 40 cm and 250 cm, respectively.
  5. which of the following can not be emitted by radioactive substances during their decay?