Wednesday, 7 February 2018

Physics homework XII-11th February Sunday


  1. What are beats? Derive an expression for beat frequency.
  2. How is it that one can recognize a friend from his voice without seeing him?
  3. What is polarization of light? State and prove Brewster's law.
  4. Is polarization possible for longitudinal wave?
  5. What is meant by wattless current?
  6. What are advantages of a.c over d.c.?
  7. Derive the condition for resonant frequency of LCR alternating current circuit.
  8. What is noise pollution? Mention its sources and preventions.
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