  Energy of elementary excitations and the anomalous nature of small Q phonons
in He-II are studied by using our macro-orbital microscopic theory of a system
of interacting bosons (cond-mat/0606571). It is observed that : (i) the
experimental E(Q) of He-II not only agrees with our theoretical relation $E(Q)
= \hbar^2Q^2/4mS(Q)$ but also supports an important conclusion of Price that
S(0) should have zero value for quantum fluids, and (ii) Feynman's energy of
excitations $E(Q)_{Fyn} = \hbar^2Q^2/2mS(Q)$ equals approximately to
$2E(Q)_{exp}$ even at low Q. Three problems with the Feynman's inference that
$E(Q)_{Fyn}$ has good agreement with $E(Q)_{exp}$ at low Q are identified. It
is argued that the theory can also be used to understand similar spectrum of
the BEC state of a dilute gas reported by O'Dell et al.
