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  1. A machine gun fires 10 bullets/s,each of mass 10 g,the speed of each bullet
  2. A bullet of mass 0.05 kg moving with a speed of 80 m/s enters a wooden
  3. In a potentiometer experiment, the balancing with a cell is at length 240 cm.
  4. Which of the following transitions in hydrogen atoms emit photons of highest frequency?
  5. In radioactive element, β-rays are emitted from