A-LevelPhysicsWavesOct/Nov 2021Paper 2 Q46 Marks
A child sits on the ground next to a remote-controlled toy car. At time t = 0, the car begins to move in a straight line directly away from the child. The variation with time t of the velocity of the car along this line is shown in [Figure 4.1]. The car's horn continually emits sound of frequency 925 Hz between time t = 0 and time t = 6.0 s. The speed of the sound in the air is 338 m s⁻¹.
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