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  1. Two sources P and Q produce notes of frequency 660 Hz each.
  2. The minimum wavelength of X-rays emitted by X-ray tube is 0.4125Å
  3. For a cubic crystal structure which one of the following relations
  4. A plank with a box on it at one end is gradually raised about the other end.
  5. A man of 50 kg mass is standing in a gravity free space at a height