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