A microphone is connected to a cathode-ray oscilloscope (CRO). The diagram shows the waveform on the CRO display when the microphone picks up a sound. The $y$-gain is adjusted to $1\,\text{V div}^{-1}$. The time-base is adjusted to $2.0\,\text{ms div}^{-1}$. Which row states the amplitude and frequency of the waveform?
Physics 9702 · AS & A Level · Progressive waves