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  1. A neutron is moving with a velocity u.It collides head on and elastically with an atom
  2. In common base circuit of a transistor, current amplification factor is 0.95.
  3. An explosion blows a rock into three parts. Two parts go off at right angles to each other
  4. The coefficient of performance of a refrigerator is 5. If the temperature inside
  5. The approxiamate ratio of nuclear mass densities of ₇₉Au¹⁹⁷ and ₄₇ Ag¹⁰⁷ nuclei is