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Arrange the following electromagnetic radiations per quantum in the order of increasing energy: A: Blue light B: Yellow light C: X-ray D: Radiowave

1. D, B, A, C
2. A, B, D, C
3. C, A, B, D
4. B, A, D, C

Correct answer: D, B, A, C

Solution

Energy per quantum increases with frequency. Increasing order: Radiowave (D) < Yellow (B) < Blue (A) < X-ray (C), i.e. D, B, A, C.

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