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  1. Colours appear on a thin soap film and soap bubbles due to the phenomenon of
  2. The acceleration due to gravity becomes (g/2) where g=acceleration due to gravity
  3. An electron moving in a uniform magnetic field of induction of intensity B,
  4. If the band gap between valence band and conduction band in a material is 5.0 eV,
  5. In a common emitter transistor amplifier, the voltage gain is