
#1
Jan1705, 07:23 PM

P: 203

Wave packets has a group velocity of
[tex]v_{group}=\frac{d\omega}{dk}[/tex] and its phase velocity is [tex]v_{phase}=\frac{\omega}{k}[/tex] Show that the group velocity and the phase velocity are related by: [tex]v_{group} = v_{phase}  \lambda\frac{dv_{phase}}{d\lambda}[/tex] Can someone please tell me where to start on this problem? 



#2
Jan1705, 07:52 PM

Sci Advisor
HW Helper
P: 11,863

All u need to know besides the rules of differentiation is
[tex] k=:\frac{2\pi}{\lambda} [/tex] Daniel. PS.Compute the RHS of your equality and show it matches the LHS. 


Register to reply 
Related Discussions  
More about wave packets  Advanced Physics Homework  15  
wave packets and particles  Quantum Physics  48  
Why wave packets?  General Physics  6  
Wave packets?  Quantum Physics  1  
wave packets spreading out  General Physics  10 