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  1. An engine is moving towards a wall with a velocity 50 ms⁻¹ emits a note of 1.2 kHz.
  2. Monochromatic light of frequency 6.0 x 10¹⁴ Hz is produced by a laser. The power emitted
  3. Which one of the following statements is WRONG in the context of X-rays generated
  4. The electric current in AC circuit is given by the relation i-3 sinωt+4 cos ωt.
  5. A bubble is rising from bottom of a lake. The volume of bubble becomes