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  1. A radio isotope X with a half life 1.4 x 10⁹ years decays to Y which is stable
  2. The Kα X-ray of molybdenum has a wavelength of 71×10⁻¹² m. If the energy of a molybdenum
  3. The focal length of the objective of a terrestrial telescope is 80 cm
  4. A particle of masses m is thrown upwards from the surface of the earth, with a velocity u
  5. By sucking through a straw, a student can reduce the pressure of his lungs