Now, a left-incident wave packet is sent toward the 
-function.
The packet is initially located at position 
at time t=0.
Compute the time required for the reflected packet to return to
position 
. How does this time compare with 
, in
other words, what is the time lag, if any, in the reflected packet?
Compute the time required for the transmitted packet to reach
position 
. How does this time compare with 
, in
other words, what is the time lag, if any, in the transmitted packet?