What is measured in Hertz (Hz)?
Explanation
Hertz is the SI unit of frequency. Option A (“Wavelength”) is incorrect because it represents a different unit, dimension, instrument, quantity or measurement relationship from the one asked. Option B (“Sound intensity”) is incorrect because it represents a different unit, dimension, instrument, quantity or measurement relationship from the one asked. Option C (“Wave speed”) is incorrect because it represents a different unit, dimension, instrument, quantity or measurement relationship from the one asked. Option A, “Wavelength”, is incorrect for this question because it does not match the precise location, process, landform, climatic feature or geographical relationship identified by the evidence. Option B, “Sound intensity”, is incorrect for this question because it does not match the precise location, process, landform, climatic feature or geographical relationship identified by the evidence. Option C, “Wave speed”, is incorrect for this question because it does not match the precise location, process, landform, climatic feature or geographical relationship identified by the evidence. In this case, the evidence supports Frequency and excludes the three alternatives.