a
Waves that vibrate in a vertical plane(standing upright)
b
The motion of the source toward the observer
c
The motion of the source away from the observer
d
waves that reflect off a boundary and interfere with themselves
Explanation
Correct Option
dVideo Explanation
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King33Victor
3 months ago
nawa ooo
just like
u poeple didn't show the sign that it is interfere distructivly or constructively.
