The diagram below shows snapshots of an oscillator at different times. What is the period of
the oscillation?
B
С
D
E
F
t=0.0 st=0.30 s t=0.45 s t=0.90 s t-1.35 s 1.80 s
+0.10 m
0
-0.10 m
(Unit = s)

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Explanation:

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the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

show the wavelengths of a wave. show the crests of a wave.