The 3 minute waves observed in K-2v emission from bright points in the
quiet solar chromosphere are shown to be oscillations of the atmosphe
re at the cutoff period of acoustic waves, implying impulsive excitati
on. Other interpretations of the period are shown not to be viable sin
ce they fail the dual requirement of spatial intermittence, in which m
ost of the supergranulation cell interior is inert over the course of
an hour, and temporal intermittence, in which the active locations in
the cell interior are active at most half the time. It is speculated t
hat the episodic excitation of the K-2v oscillations is due to collisi
ons of granules with magnetic elements of mixed polarity with a field
strength of at least 0.5 kG.