What does a frequency of one hertz (1 Hz) mean?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → One oscillation per second
Frequency is the number of oscillations (vibrations) completed in one second. Its SI unit, the hertz, equals one oscillation per second. Metre per second is a unit of speed, and joule per second is a unit of power, not of frequency.