A cathode-ray oscilloscope shows a square wave, as illustrated. The time-base setting is $0.20\,\text{ms}$ per division. What is the frequency of the square wave?
- A$0.83\,\text{Hz}$
- B$830\,\text{Hz}$
- C$1300\,\text{Hz}$
- D$1700\,\text{Hz}$
Physics 9702 · AS & A Level · Practical circuits