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  1. A source is moving towards an observer with a speed of 20 m/s and having frequency
  2. λ₁ and λ₂ are used to illuminate the slits. β₁ and β₂ are the corresponding fringe
  3. In a circuit, L,C and R are connected in series with an alternating voltage source
  4. A spherical body of emissivity e=0.6, placed inside a perfectly black body is maintained
  5. A bullet loses 1/20 of its velocity after penetrating a plank.How many planks