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  1. If critical angle for a material to air passage is 30°, the refractive index
  2. In communication with help of antenna if height is doubled then the range
  3. A projectile is thrown in the upward direction making an angle of 60°with the horizontal
  4. When two identical capacitors are in series, they have 3 μF capacitance
  5. If wavelength of a wave is λ=6000 Å, then wave number will be