Abstract
We show that Smarr's calculation of the zero-frequency limit of the energy spectrum for the gravitational radiation produced during the scattering or collision of two particles is a linearized approximation valid only when the radiation is weak. In particular, it cannot be applied to the head-on collision of two black holes, so Smarr's conclusions concerning the isotropy of the radiation emitted during the high-speed, equal-mass, black-hole collision have no firm foundation.

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