6.1 State the Doppler effect. (2)
6.2 Use the graph to answer the following questions.
6.2.1 Write down the frequency of the sound emitted by the stationary
source.
Give a reason for the answer. (2)
6.2.2 In which direction is the car moving relative to the source?
Choose from TOWARDS or AWAY.
Give a reason for the answer. (2)
6.2.3 Calculate the speed of sound in air. (5)
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