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  1. When a light beam of frequency v is incident on a metal surface,
  2. A hollow metal sphere of radius 10 cm is charged such that the potential on its surface
  3. An electromagnetic wave of frequency v = 3.0 MHz passes from vacuum into
  4. If the alternating current I=I₁ cos⁡ωt+I₂ sin⁡ωt, then the rms current is given by
  5. The magnifying power of the astronomical telescope for normal adjustment is 50.