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The transition of electron from energy level W1 to W2 is associated with emission or absorption of electro magnetic radiation of frequency f such that

hf = |W1 - W2|
|W1 - W2|f = h
hf = 0.5|W1 - W2|
(hf)2 = |W1 - W2|

Correct Answer: hf = |W1 - W2|

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