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  1. Which scientist experimentally proved the existence of electromagnetic waves?
  2. Shearing stress causes change in
  3. The threshold frequency for a photosensitive metal is 3.3 x 10¹⁴ Hz.
  4. In Young’s double slit experiment with sodium vapour lamp of wavelength
  5. Two particles A and B, move with constant velocities V₁ and V₂. At the initial