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The wave emitted by any atom or molecule must have some finite total length which is known as the coherence length. For sodium light, this length is 2.4cm. The number of oscillations in this length will be Given l = 5900blank A to the power of 0 end exponent

  1. 4.068 cross times 10 to the power of 5 end exponent Hz    
  2. 4.068 cross times 10 to the power of 4 end exponent Hz    
  3. 4.068 cross times 10 to the power of 6 end exponent Hz    
  4. 4.068 cross times 10 to the power of 8 end exponent Hz    

The correct answer is: 4.068 cross times 10 to the power of 4 end exponent Hz

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