Discussion
Which of the following sets contains only the units of measuring distance ?
Answer: C
The set with only units of distance is cubit, metre, light year.
The metre is the SI unit of length. The cubit is an old unit of length based on the forearm, from the elbow to the tip of the middle finger. The light year is the distance light travels in one year, about \(9.46 \times 10^{15}\) m, used for astronomical distances despite the word 'year' in its name.
The other sets each contain an intruder: the hertz is the unit of frequency, and the year is a unit of time.
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