The diagram depicts a pipe containing air and open at both ends. The pipe has a length of $1.00\,\text{m}$, and a thin layer of fine sand coats the lower inner surface of the pipe. When a sound source of one frequency is placed close to one end of the pipe, resonance occurs in the air inside the pipe, and the sand pattern indicates that a standing wave with three nodes is produced in the pipe. The speed of sound in air is $330\,\text{m s}^{-1}$. What is the frequency of the sound?
- A$330\,\text{Hz}$
- B$495\,\text{Hz}$
- C$990\,\text{Hz}$
- D$1320\,\text{Hz}$