A whale emits sound waves at a frequency of $5\,\text{Hz}$. These waves are picked up by a microphone and shown on an oscilloscope. What is the time-base setting on the oscilloscope?
- A$0.1\,\text{ms div}^{-1}$
- B$1\,\text{ms div}^{-1}$
- C$10\,\text{ms div}^{-1}$
- D$100\,\text{ms div}^{-1}$