1.
A source of sound moves along a circle of radius 2 m2\,\text{m} with constant angular velocity 40 rad/s40\,\text{rad/s}. The frequency of the source is 300 Hz300\,\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 m/s= 320\,\text{m/s})