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  1. An ideal black body is equivalent to
  2. Two metal rods 1 and 2 of same lengths have same temperature difference
  3. A uniform rod of length l is placed with one end in contact with the horizontal
  4. The near point and far point of a person are 40 cm and 250 cm, respectively.
  5. If a spring of spring constant k stretched by a length x under tension T, the energy