  We have studied the collective excitation of fractional quantum Hall effect
(FQHE) in the rotating Bose-Einstein condensate (BEC) using CF theory at the
filling fraction $\nu=1/2$. The roton type of excitation in the FQHE of
electron system is established over the years for all the filling fraction,
whereas the collective excitation at $\nu=1/2$ filling fraction in the rotating
BEC shows no roton minimum. We have investigated this using composite fermion
theory with the P$\ddot{o}$schl-Teller interaction potential between the
particles. We have seen that the long range interaction will give the roton,
whereas short range interaction gives no roton minimum.
