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If the dispersion relation for electromagnetic waves of wave vector k in the ionoshpere is , then the group velocity vg and phase velocity vp are related as :
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
If the dispersion relation for electromagnetic waves of wave vector k ...
We have ...(i)
The phase velocity  ...(ii)
The group velocity  ...(iii)
Differentiate equation, we get 
⇒  ...(iv)
By Eq. (ii) ω= kvp
Eq. (iv) ⇒  ⇒   ⇒ 
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Most Upvoted Answer
If the dispersion relation for electromagnetic waves of wave vector k ...
We have ...(i)
The phase velocity  ...(ii)
The group velocity  ...(iii)
Differentiate equation, we get 
⇒  ...(iv)
By Eq. (ii) ω= kvp
Eq. (iv) ⇒  ⇒   ⇒ 
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If the dispersion relation for electromagnetic waves of wave vector k in the ionoshpere is , then the group velocity vg and phase velocity vp are related as :a)b)c)d)Correct answer is option 'C'. Can you explain this answer?
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