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  1. The ratio of minimum wavelengths of Lyman and Balmer series will be
  2. A wave travelling in the +ve x-direction having displacement along y-direction as 1m
  3. The acceleration due to gravity at a place is π² m/sec². Then the time period
  4. Masses of three wires of copper are in the ratio of 1:3:5 and their lengths
  5. When the angle of incidence is 60° on the surface of a glass slab, it is found