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  1. The total radiant energy per unit area, normal to the direction of incidence
  2. At what distance from the centre of earth, the value of acceleration due to gravity
  3. A stone of mass 1 kg tied to a light inexensible string of length L=10/3 is whirling
  4. Huygen’s principle of secondary wavelets may be used to
  5. The parallel beams of monochromatic light of wavelength 4.5 x10⁻⁷ m passes through