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  1. Light of frequency 8×10¹⁵ Hz is incident on a substance of photoelectric work
  2. A thin glass(refractive index 1.5) lens has optical power of -5D in air.
  3. The flux linked with a circuit is given by φ=t³+3t-7. The graph between time
  4. A thin circular ring of mass M and radius R rotates about an axis through its centre
  5. A calorimeter contains 0.2 kg of water at 30° C. 0.1kg of water at