A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, its speed:

increases.

decreases.

stays constant.

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F$1$

F$2$

F$3$

F$4$

F$5$

F$6$

F$7$

@

#

$

$\%$

${?}^{{?}^{?}}$

$4$

$5$

$6$

$8$