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  1. A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
  2. Which one of the following is not due to total internal reflection?
  3. To obtain a p-type semiconductor, germanium must be doped with
  4. When there is no heat change from surroundings in a system, then the process
  5. A current I ampere flows along the inner conductor of a co-axial cable and returns