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  1. Electrons in a certain energy level n=n₁, can emit 3 spectral lines. When they
  2. A body cools in 7 minute from 60⁰C to 40⁰C. What time, in minute does it take to cool
  3. Two parallel long wires carry currents i₁ and i₂ with i₁ > i₂ .
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