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  1. A bus is moving with a velocity of 5 ms⁻¹ towards a huge wall.
  2. The threshold frequency for a photosensitive metal is 3.3 x 10¹⁴ Hz.
  3. In the Bohr’s model of hydrogen atom, the ratio of the kinetic energy to the total
  4. A hollow sphere of charge does not produce an electric field at any
  5. For photoelectric emission to take place