A source of sound waves of frequency 1080 Hz moves to the right with a speed of 33 ms -1 relative to the ground. To its right is a reflecting surface moving to the left with a speed of 66 ms -1 relative to the ground. Assuming the speed of sound in air to be 330 ms -1 , find:
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0.27 m, 0.34 m,
1440 Hz,
0.23 m
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