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  1. Which of the following is or the property of a cathode ray
  2. A wire of length 1 m is placed in a uniform magnetic field of 1.5 tesla at an angle
  3. A satellite is revolving around the earth with a kinetic energy E. The minimum
  4. The photoelectric threshold wevelength for potassium (work function being 2 eV) is
  5. The half-life of a radioactive substance is 30 min. The time (in minutes) taken