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There are 1 n photons of frequency 1  in a beam of light. In an equally energetic beam, there are 2 n photons of frequency 2  . Then the correct relation is

1. 1 2 1  n n
2. 2 1 2 1    n n
3. 1 2 2 1    n n
4. 2 2 2 1 2 1    n n

Correct answer: 1 2 2 1    n n

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