The diagram shows a trace of a wave on a cathode-ray oscilloscope.
The vertical and horizontal gridlines have a spacing of 1.0 cm. The voltage scaling is $4Vc{m^{ - 1}}$ and the time scaling is $5msc{m^{ - 1}}$.
What are the amplitude and period of the wave?
1 )
A
2 )
B
C
4 )
D
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