Only BC part of this graph can't explain by the electromagnetic wave theory. Because the intensity of the wavelength is so less, Option C is correct.
What is spectrum?
A spectrum is a graph or chart that shows how much light is emitted across a wide range of energies. Atomic spectroscopy studies the excitation of conduction electrons in any element.
Only the BC portion of this graph is not explained by electromagnetic wave theory. Because the wavelength's intensity is so low,
Hence, option C is correct.
To learn more about the spectrum, refer to the link;
brainly.com/question/1553971
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