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  1. If v is the speed of sound in air, then the shortest length of the closed pipe
  2. When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
  3. The Kα X-ray of molybdenum has a wavelength of 71×10⁻¹² m. If the energy of a molybdenum
  4. Complete the reaction: ₀n¹+ ₉₂U²³⁵→₅₆Ba¹⁴⁴+……..+3n
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