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Question

The energy of an electrmagnetic radiation is 19.875 × 1013 erg. What is the wave number in cm1? h = 6.625 × 1027 erg.Sec; c = 3 × 1010cm.sec1
  1. 1000

  2. 106

  3. 100

  4. 10,000


Solution

The correct option is D

10,000


¯¯¯v = Ehc = 19.895 × 10136.625 × 1027 × 3 × 1010

= 10,000

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