  We analyze spacetime momentum currents on a classical string worldsheet,
study their generic connection via AdS/CFT correspondence to the instantaneous
energy loss of the dual field theory degrees of freedom and suggest a general
formula for computing energy loss in a time-dependent string configuration.
Applying this formula to the case of falling strings, generally dual to light
quarks, reveals that the energy loss does not display a well-pronounced Bragg
peak at late times, as previously believed. Finally, we comment on the possible
implications of this result to the jet quenching phenomena in heavy ion
collisions.
