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  1. The atomic number of the most common element in nuclear fusion is
  2. A radiactive substance emits 100 beta particles in the first 2s and 50 beta
  3. Which series of hydrogen spectrum corresponds to ultraviolet region?
  4. When sound is produced in an aeroplane with a velocity of 200 m/s horizontally,
  5. A galvanometer acting as a voltmeter will have