Verified Answer :

thatonedude

The period and frequency are measured in hertz. Amplitude and wavelength are measured in metres.

AL2006

a). period is time

b). amplitude can be almost anything that waves . . . length, voltage, pressure, current etc.
But not hertz.

c). frequency ... "oftenness ... reciprocal time. the only item on this list that CAN be measured in Hertz.

d). wavelength ... length units

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