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The potential energy, U of three simple harmonic oscillations varies with displacement 'X' from the mean position as shown in the figure. These oscillators have the same mass but different amplitudes A1, A2 and A3. Their characteristic frequencies n1, n2 and n3 are related to each other as

  1. [I] & [II] are correct    
  2. [I] & [III] are correct    
  3. [II] & [III] are correct    
  4. [II] & [IV] are correct    

The correct answer is: [I] & [II] are correct

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