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  1. A wave in a string has an amplitude of 2cm. The wave travels in the positive direction
  2. A machine gun fires 10 bullets/s,each of mass 10 g,the speed of each bullet
  3. Source S₁ is producing, 10¹⁵ photons per second of wavelength 5000Å
  4. The ratio of magnetic dipole moment of an electron of charge e and mass m
  5. The heart of a man pumps 5 litres of blood through the arteries per minute at