A source of sound moves along a circle of radius $2\,\text{m}$ with constant angular velocity $40\,\text{rad/s}$. The frequency of the source is $300\,\text{Hz}$. A detector is kept at some distance from the circle in the same plane (as shown in the figure). Which of the following is not a possible value of the frequency registered by the detector? (Speed of sound $= 320\,\text{m/s}$)