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  1. Light of frequency 8×10¹⁵ Hz is incident on a substance of photoelectric work
  2. When ₉₀Th²²⁸ transforms to ₈₃Bi²¹², the number of emitted α and β particles
  3. The threshold frequency for a certain photosensitive metal is ν₀. When it is illuminated
  4. If r be the distance of a point on the axis of a magnetic dipole from its centre
  5. The drift velocity of the electrons in a copper wire of length 2 m under