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  1. Kepler’s third law states that square of period of revolution (T) of a planet
  2. Hard X-rays for the study of fractures in bones should have a minimum wavelength
  3. A plane electromagnetic wave of frequency 20 MHz travels through a space along
  4. A and B are two metals with threshold frequencies 1.8 x 10¹⁴ Hz and 2.2 x 10¹⁴ Hz.
  5. A body weighs 50 grams in air and 40 grams in water. How much would it weigh in a liquid