Question:

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

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Photon energy is \(E = h\nu\); rank the radiations by frequency.
Updated On: Nov 11, 2026
  • C, A, B, D
  • B, A, D, C
  • D, B, A, C
  • A, B, D, C
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The Correct Option is C

Solution and Explanation

Energy per quantum \(E = h\nu = \frac{hc}{\lambda}\), so it increases with frequency (decreases with wavelength).
Order of frequency in the electromagnetic spectrum: radiowave < yellow light < blue light < X-ray.
So the increasing order of energy is D, B, A, C.
Answer: (3) D, B, A, C
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