A) \[{{v}_{g}}>{{v}_{X}}>{{v}_{m}}\]
B) \[{{v}_{g}}<{{v}_{X}}<{{v}_{m}}\]
C) \[{{v}_{g}}<{{v}_{X}}>{{v}_{m}}\]
D) \[{{v}_{g}}={{v}_{X}}={{v}_{m}}\]
Correct Answer: D
Solution :
These are electromagnetic waves. We know that electromagnetic waves moves with speed of light. So, option is correct.
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