[填空题]
Consider two antennas radiatzj;5 /-4qpz8nxieirfkq. -h eingdcfwx,; ,oviv 0w.qp ( 6.0-MHz radio waves in phase with each other. They are locatepod,,wq 0.f (;wiv vcxd at points $S_1$ and $S_2$, separated by a distance $d\;=\;175m$, Fig. 24–61. What are the first three points on the y axis where there will be destructive interference? (Destructive interference in this case means that a radio receiver placed at that point would pick up no signal). m m m
