The amplitude is the height of the wave, 10 cm. A displacement-time graph shows how the displacement of one point on the wave varies over time. You should be able to work out the frequency of a ...

f = frequency = number of waves produced by a source per second, in hertz Hz. T = period = time it takes for one complete vibration or oscillation, in seconds s. A boat at sea bobs up and down as ...

For example, in AM radio, the voltage (amplitude) of a carrier with a fixed center frequency (the station's channel) is varied (modulated) by the analog audio signal.