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  1. A 1 kg particle strikes a wall with velocity 1 m/s at an angle 30° and reflects
  2. When a metallic surface is illuminated with radiation of wavelength λ,
  3. Diameter of the objective of a telescope is 200 cm. What is the resolving power
  4. A closely wound solenoid of 2000 turns and area of cross-section 1.5 x 10⁻⁴ m² carries
  5. The turn ratio of a transformer is 1:2. An electrolytic dc cell of emf 2 volt is connected