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  1. A string in musical instrument is 50 cm long and its fundamental frequency is 800 Hz.
  2. A solenoid has length 0.4 cm, radius 1 cm and 400 turns of wire. If a current
  3. A beam of light of λ=600 nm from a distant source falls on a single slit 1 mm wide
  4. An artificial satellite is revolving round the earth in a circular orbit. Its velocity
  5. The relationship between decay constant λ and half-life T of a radioactive substance is