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  1. A plank with a box on it at one end is gradually raised about the other end.
  2. When light of wavelength 300 nm falls on a photoelectric emitter,
  3. Power dissipated in an LCR series circuit connected to an a.c source of emf ? is
  4. The reddish appearance of the sun at sunrise and sunset is due to
  5. In Young’s double slit experiment with sodium vapour lamp of wavelength